diff --git a/texk/mendexk/ChangeLog b/texk/mendexk/ChangeLog
index aa76092bbc..b443138bec 100644
--- a/texk/mendexk/ChangeLog
+++ b/texk/mendexk/ChangeLog
@@ -1,7 +1,22 @@
+2021-09-18  TANAKA Takuji  <ttk@t-lab.opal.ne.jp>
+
+	* fread.c, fwrite.c, sort.c, mendex.h, {,ex}var.h:
+	Extend levels of page numbers from 3 to 10
+	for compatibility with makeindex.
+	Fix a bug of page ranges with multi-level page numbers.
+	* fread.c:
+	Strict check for "page_precedence" and "page_compositor" in style file.
+	* fwrite.c:
+	Do not break lines before "delim_n".
+	* tests/mendex.test, tests/range.idx, tests/range[123].{ist,ind},
+	removed tests/rangetwo.*:
+	Update tests.
+	* version.h: Date [18-Sep-2021]
+
 2021-09-04  TANAKA Takuji  <ttk@t-lab.opal.ne.jp>
 
 	* configure.ac, version.h:
-	Version 3.6 [6-Jun-2021].
+	Version 3.6 [4-Sep-2021].
 	* styfile.c, sort.c, fwrite.c, mendex.h, {,ex}var.h:
 	Support output order of symbols and numbers separately
 	when "symbol_flag" is 2 in style file.
diff --git a/texk/mendexk/exvar.h b/texk/mendexk/exvar.h
index 8d5925443c..7d3aa7a134 100644
--- a/texk/mendexk/exvar.h
+++ b/texk/mendexk/exvar.h
@@ -2,7 +2,7 @@ extern FILE *efp;
 
 extern int lines,idxcount,acc,reject;
 extern int prange,fsti,lorder,bcomp,force,fpage,gflg,verb,debug;
-extern int warn,scount,pattr[3];
+extern int warn,scount,pattr[];
 
 extern struct index *ind;
 
diff --git a/texk/mendexk/fread.c b/texk/mendexk/fread.c
index 793bc4c593..855920f4cf 100644
--- a/texk/mendexk/fread.c
+++ b/texk/mendexk/fread.c
@@ -456,25 +456,54 @@ static void copy_multibyte_char(char *buff1, char *buff2, int *i, int *j)
 
 static void chkpageattr(struct page *p)
 {
-	int i,j,cc=0;
+	int i,j,cc=0,cnt,pplen,pclen;
+	char buff[16],*pcpos,*page0;
 
+	pplen=strlen(page_precedence);
+	pclen=strlen(page_compositor);
 	for (i=0;i<strlen(p->page);i++) {
-		if (strncmp(page_compositor,&p->page[i],strlen(page_compositor))==0) {
+		page0=&p->page[i];
+		if (strncmp(page_compositor,page0,pclen)==0) {
 			p->attr[cc]=pattr[cc];
 			cc++;
-			i+=strlen(page_compositor)-1;
+			i+=pclen-1;
+			if (cc>=PAGE_COMPOSIT_DEPTH) {
+				if (pclen>0)
+					verb_printf(efp, "\nToo many fields of page number \"%s\".\n", p->page);
+				else
+					verb_printf(efp, "\nIllegular page_comositor specification.\n");
+				exit(253);
+			}
 		}
 		else {
-ATTRLOOP:
-			if (!((p->page[i]>='0' && p->page[i]<='9') || (p->page[i]>='A' && p->page[i]<='Z') || (p->page[i]>='a' && p->page[i]<='z'))) {
+			cnt=0;
+			if (!((*page0>='0' && *page0<='9') || (*page0>='A' && *page0<='Z') || (*page0>='a' && *page0<='z'))) {
 				p->attr[cc]= -1;
 				if (cc<2) p->attr[++cc]= -1;
 				return;
 			}
+			pcpos=strstr(page0,page_compositor);
+			j=pcpos ? pcpos-page0 : strlen(page0);
+			if (j>15) {
+				verb_printf(efp, "\nToo long page number string \"%s\".\n", page0);
+				exit(253);
+			}
+			strncpy(buff,page0,j);
+			buff[j]='\0';
+ATTRLOOP:
+			cnt++;
+			if (cnt>pplen) {
+				verb_printf(efp, "\nFailed to find page type for page \"%s\" in page_precedence specification (%s).\n",
+					    page0, page_precedence);
+				exit(253);
+			}
+
 			switch(page_precedence[pattr[cc]]) {
 			case 'r':
-				if (strchr("ivxlcdm",p->page[i])==NULL) {
-					if (pattr[cc]<strlen(page_precedence)-1)
+				if (strchr("ivxlcdm",*page0)==NULL ||
+				    (strchr("lcdm",*page0) && strchr(page_precedence,'a') && strlen(buff)==1 && pcpos))  {
+					/* heuristic detection as alphabet since L=50, C=100, D=100, M=1000 are quite large */
+					if (pattr[cc]<pplen-1)
 						pattr[cc]++;
 					else pattr[cc]=0;
 					for (j=cc+1;j<3;j++) pattr[j]=0;
@@ -482,8 +511,10 @@ static void chkpageattr(struct page *p)
 				}
 				break;
 			case 'R':
-				if (strchr("IVXLCDM",p->page[i])==NULL) {
-					if (pattr[cc]<strlen(page_precedence)-1)
+				if (strchr("IVXLCDM",*page0)==NULL ||
+				    (strchr("LCDM",*page0) && strchr(page_precedence,'A') && strlen(buff)==1 && pcpos))  {
+					/* heuristic detection as alphabet since L=50, C=100, D=100, M=1000 are quite large */
+					if (pattr[cc]<pplen-1)
 						pattr[cc]++;
 					else pattr[cc]=0;
 					for (j=cc+1;j<3;j++) pattr[j]=0;
@@ -491,8 +522,8 @@ static void chkpageattr(struct page *p)
 				}
 				break;
 			case 'n':
-				if (p->page[i]<'0' || p->page[i]>'9') {
-					if (pattr[cc]<strlen(page_precedence)-1)
+				if (*page0<'0' || *page0>'9') {
+					if (pattr[cc]<pplen-1)
 						pattr[cc]++;
 					else pattr[cc]=0;
 					for (j=cc+1;j<3;j++) pattr[j]=0;
@@ -500,8 +531,8 @@ static void chkpageattr(struct page *p)
 				}
 				break;
 			case 'a':
-				if (p->page[i]<'a' || p->page[i]>'z') {
-					if (pattr[cc]<strlen(page_precedence)-1)
+				if (*page0<'a' || *page0>'z' || strlen(buff)>1) {
+					if (pattr[cc]<pplen-1)
 						pattr[cc]++;
 					else pattr[cc]=0;
 					for (j=cc+1;j<3;j++) pattr[j]=0;
@@ -509,8 +540,8 @@ static void chkpageattr(struct page *p)
 				}
 				break;
 			case 'A':
-				if (p->page[i]<'A' || p->page[i]>'Z') {
-					if (pattr[cc]<strlen(page_precedence)-1)
+				if (*page0<'A' || *page0>'Z' || strlen(buff)>1) {
+					if (pattr[cc]<pplen-1)
 						pattr[cc]++;
 					else pattr[cc]=0;
 					for (j=cc+1;j<3;j++) pattr[j]=0;
@@ -518,7 +549,9 @@ static void chkpageattr(struct page *p)
 				}
 				break;
 			default:
-				break;
+				verb_printf(efp, "\nUnknown page type '%c' in page_precedence specification (%s).\n",
+					   page_precedence[pattr[cc]], page_precedence);
+				exit(253);
 			}
 		}
 	}
diff --git a/texk/mendexk/fwrite.c b/texk/mendexk/fwrite.c
index 4ae17228e2..ef97d0c87a 100644
--- a/texk/mendexk/fwrite.c
+++ b/texk/mendexk/fwrite.c
@@ -14,7 +14,7 @@ int line_length=0;
 
 static void printpage(struct index *ind, FILE *fp, int num, char *lbuff);
 static int range_check(struct index ind, int count, char *lbuff);
-static void linecheck(char *lbuff, char *tmpbuff);
+static void linecheck(char *lbuff, char *tmpbuff, int force);
 static void crcheck(char *lbuff, FILE *fp);
 
 /* All buffers have size BUFFERLEN.  */
@@ -115,6 +115,22 @@ void verb_printf(FILE *fp, const char *format, ...)
     if (fp!=stderr) fputs(print_buff, fp);
 }
 
+static int pnumconv2(struct page *p)
+{
+	int j,k,cc,pclen;
+
+	pclen=strlen(page_compositor);
+	for (j=k=cc=0;j<strlen(p->page);j++) {
+		if (strncmp(p->page+j,page_compositor,pclen)==0) {
+			j+=pclen;
+			k=j;
+			cc++;
+			continue;
+		}
+	}
+	return pnumconv(p->page+k,p->attr[cc]);
+}
+
 
 /*   write ind file   */
 void indwrite(char *filename, struct index *ind, int pagenum)
@@ -348,10 +364,8 @@ static void printpage(struct index *ind, FILE *fp, int num, char *lbuff)
 	for(j=0;j<ind[num].num;j++) {
 		cc=range_check(ind[num],j,lbuff);
 		if (cc>j) {
-			int epage = pnumconv(ind[num].p[cc].page,
-    		       	                     ind[num].p[cc].attr[0]);
-			int bpage = pnumconv(ind[num].p[j].page,
-			                     ind[num].p[j].attr[0]);
+			int epage = pnumconv2(&ind[num].p[cc]);
+			int bpage = pnumconv2(&ind[num].p[j]);
 			if (epage==bpage) {
 				j=cc-1;
 				continue;
@@ -365,13 +379,13 @@ static void printpage(struct index *ind, FILE *fp, int num, char *lbuff)
 			}
 			/* print beginning of range */
 			SAPPENDF(buff,"%s",ind[num].p[j].page);
-			if (strlen(suffix_3p)>0 && (epage-bpage)==2) {
+			if (strlen(suffix_3p)>0 && epage-bpage==2) {
 				SAPPENDF(buff,"%s",suffix_3p);
 			}
-			else if (strlen(suffix_mp)>0 && (epage-bpage)>=2) {
+			else if (strlen(suffix_mp)>0 && epage-bpage>=2) {
 				SAPPENDF(buff,"%s",suffix_mp);
 			}
-			else if (strlen(suffix_2p)>0 && (epage-bpage)==1) {
+			else if (strlen(suffix_2p)>0 && epage-bpage==1) {
 				SAPPENDF(buff,"%s",suffix_2p);
 			}
 			else {
@@ -383,14 +397,14 @@ static void printpage(struct index *ind, FILE *fp, int num, char *lbuff)
 			if (strlen(ind[num].p[j].enc)>0) {
 				SAPPENDF(tmpbuff,"%s",encap_suffix);
 			}
-			linecheck(lbuff,tmpbuff);
+			linecheck(lbuff,tmpbuff, FALSE);
 			j=cc;
 			if (j==ind[num].num) {
 				goto PRINT;
 			}
 			else {
 				SAPPENDF(tmpbuff,"%s",delim_n);
-				linecheck(lbuff,tmpbuff);
+				linecheck(lbuff,tmpbuff, TRUE);
 			}
 		}
 		else if (strlen(ind[num].p[j].enc)>0) {
@@ -411,19 +425,19 @@ static void printpage(struct index *ind, FILE *fp, int num, char *lbuff)
 				SAPPENDF(tmpbuff,"%s",ind[num].p[j].page);
 				SAPPENDF(tmpbuff,"%s",encap_suffix);
 				SAPPENDF(tmpbuff,"%s",delim_n);
-				linecheck(lbuff,tmpbuff);
+				linecheck(lbuff,tmpbuff, FALSE);
 			}
 			else {
 				SAPPENDF(tmpbuff,"%s",ind[num].p[j].page);
 				SAPPENDF(tmpbuff,"%s",delim_n);
-				linecheck(lbuff,tmpbuff);
+				linecheck(lbuff,tmpbuff, FALSE);
 			}
 		}
 		else {
 /* no encap */
 			SAPPENDF(tmpbuff,"%s",ind[num].p[j].page);
 			SAPPENDF(tmpbuff,"%s",delim_n);
-			linecheck(lbuff,tmpbuff);
+			linecheck(lbuff,tmpbuff, FALSE);
 		}
 	}
 
@@ -455,7 +469,7 @@ static void printpage(struct index *ind, FILE *fp, int num, char *lbuff)
 	else {
 		SAPPENDF(tmpbuff,"%s",ind[num].p[j].page);
 	}
-	linecheck(lbuff,tmpbuff);
+	linecheck(lbuff,tmpbuff, FALSE);
 
 PRINT:
 	fputs(lbuff,fp);
@@ -499,7 +513,7 @@ static int range_check(struct index ind, int count, char *lbuff)
 					if (strlen(ind.p[j].enc)>0) {
 						SPRINTF(tmpbuff,"%s%s%s%s%s%s",encap_prefix,ind.p[j].enc,encap_infix
 						                              ,ind.p[j].page,encap_suffix,delim_n);
-						linecheck(lbuff,tmpbuff);
+						linecheck(lbuff,tmpbuff, FALSE);
 					}
 				}
 			}
@@ -528,8 +542,8 @@ static int range_check(struct index ind, int count, char *lbuff)
 			break;
 		}
 	}
-	cc1=pnumconv(ind.p[i-1].page,ind.p[i-1].attr[0]);
-	cc2=pnumconv(ind.p[count].page,ind.p[count].attr[0]);
+	cc1=pnumconv2(&ind.p[i-1]);
+	cc2=pnumconv2(&ind.p[count]);
 	if (cc1>=cc2+2 || (cc1>=cc2+1 && strlen(suffix_2p)) || force) {
 		return i-1;
 	}
@@ -537,9 +551,9 @@ static int range_check(struct index ind, int count, char *lbuff)
 }
 
 /*   check line length   */
-static void linecheck(char *lbuff, char *tmpbuff)
+static void linecheck(char *lbuff, char *tmpbuff, int force)
 {
-	if (line_length+strlen(tmpbuff)>line_max) {
+	if (line_length+strlen(tmpbuff)>line_max && !force) {
 		SAPPENDF(lbuff,"\n");
 		SAPPENDF(lbuff,"%s",indent_space);
 		SAPPENDF(lbuff,"%s",tmpbuff);
diff --git a/texk/mendexk/mendex.h b/texk/mendexk/mendex.h
index 1c0190c282..6244c24fd1 100644
--- a/texk/mendexk/mendex.h
+++ b/texk/mendexk/mendex.h
@@ -11,10 +11,12 @@
 #define nkf_close(fp) {clear_infile_enc(fp); fclose(fp);}
 #endif
 
+#define PAGE_COMPOSIT_DEPTH 10
+
 struct page {
 	char *page;
 	char *enc;
-	int attr[3];
+	int attr[PAGE_COMPOSIT_DEPTH];
 };
 
 struct index {
diff --git a/texk/mendexk/sort.c b/texk/mendexk/sort.c
index 6ab458ee02..19e04298fc 100644
--- a/texk/mendexk/sort.c
+++ b/texk/mendexk/sort.c
@@ -62,6 +62,8 @@ static int wcomp(const void *p, const void *q)
 {
 	int i, j, prechar = 0;
 	const struct index *index1 = p, *index2 = q;
+	char ch1, ch2;
+	char *str1, *str2;
 
 	scount++;
 
@@ -73,49 +75,54 @@ static int wcomp(const void *p, const void *q)
 
 		for(i=0;;i++) {
 
+			str1=&((*index1).dic[j][i]);
+			str2=&((*index2).dic[j][i]);
+			ch1=(*index1).dic[j][i];
+			ch2=(*index2).dic[j][i];
+
 /*   even   */
-			if (((*index1).dic[j][i]=='\0')&&((*index2).dic[j][i]=='\0')) break;
+			if ((ch1=='\0')&&(ch2=='\0')) break;
 
 /*   index1 is shorter   */
-			if ((*index1).dic[j][i]=='\0') return -1;
+			if (ch1=='\0') return -1;
 
 /*   index2 is shorter   */
-			if ((*index2).dic[j][i]=='\0') return 1;
+			if (ch2=='\0') return 1;
 
 /*   priority   */
 			if ((priority!=0)&&(i>0)) {
 				if (prechar==0) {
-					if ((japanese(&(*index1).dic[j][i]))
-						&&(!japanese(&(*index2).dic[j][i])))
+					if ((japanese(str1))
+						&&(!japanese(str2)))
 						return -1;
 
-					if ((japanese(&(*index2).dic[j][i]))
-						&&(!japanese(&(*index1).dic[j][i])))
+					if ((japanese(str2))
+						&&(!japanese(str1)))
 						return 1;
 				}
 				else {
-					if ((japanese(&(*index1).dic[j][i]))
-						&&(!japanese(&(*index2).dic[j][i])))
+					if ((japanese(str1))
+						&&(!japanese(str2)))
 						return 1;
 
-					if ((japanese(&(*index2).dic[j][i]))
-						&&(!japanese(&(*index1).dic[j][i])))
+					if ((japanese(str2))
+						&&(!japanese(str1)))
 						return -1;
 				}
 			}
 
 /*   compare group   */
-			if (ordering(&(*index1).dic[j][i])<ordering(&(*index2).dic[j][i]))
+			if (ordering(str1)<ordering(str2))
 				return -1;
 
-			if (ordering(&(*index1).dic[j][i])>ordering(&(*index2).dic[j][i]))
+			if (ordering(str1)>ordering(str2))
 				return 1;
 
 /*   symbol pattern   */
-			if ((!numeric(&(*index1).dic[j][i]))&&(numeric(&(*index2).dic[j][i])))
+			if ((!numeric(str1))&&(numeric(str2)))
 				return -1;
 
-			if ((!numeric(&(*index2).dic[j][i]))&&(numeric(&(*index1).dic[j][i])))
+			if ((!numeric(str2))&&(numeric(str1)))
 				return 1;
 
 /*   simple compare   */
@@ -169,12 +176,12 @@ void pagesort(struct index *ind, int num)
 static int pcomp(const void *p, const void *q)
 {
 	int i,j,cc=0,num1,num2;
-	char buff[16];
+	char buff[16],*p0,*p1;
 	const struct page *page1 = p, *page2 = q;
 
 	scount++;
 
-	for (i=0;i<3;i++) {
+	for (i=0;i<PAGE_COMPOSIT_DEPTH;i++) {
 		if ((page1->attr[i]<0)&&(page2->attr[i]<0)) return 0;
 		else if ((page1->attr[i]<0)&&(page2->attr[i]>=0)) return -1;
 		else if ((page2->attr[i]<0)&&(page1->attr[i]>=0)) return 1;
@@ -182,18 +189,18 @@ static int pcomp(const void *p, const void *q)
 		if (page1->attr[i]>page2->attr[i]) return 1;
 		if (page1->attr[i]<page2->attr[i]) return -1;
 
-		for (j=cc;j<strlen(page1->page);j++) {
-			if (strncmp(&page1->page[j],page_compositor,strlen(page_compositor))==0) break;
-		}
-		strncpy(buff,&page1->page[cc],j-cc);
-		buff[j-cc]='\0';
+		p0=&page1->page[cc];
+		p1=strstr(p0, page_compositor);
+		j=p1 ? p1-p0 : strlen(p0);
+		strncpy(buff,p0,j);
+		buff[j]='\0';
 		num1=pnumconv(buff,page1->attr[i]);
 
-		for (j=cc;j<strlen(page2->page);j++) {
-			if (strncmp(&page2->page[j],page_compositor,strlen(page_compositor))==0) break;
-		}
-		strncpy(buff,&page2->page[cc],j-cc);
-		buff[j-cc]='\0';
+		p0=&page2->page[cc];
+		p1=strstr(p0, page_compositor);
+		j=p1 ? p1-p0 : strlen(p0);
+		strncpy(buff,p0,j);
+		buff[j]='\0';
 		num2=pnumconv(buff,page2->attr[i]);
 
 		if (num1>num2) return 1;
@@ -202,7 +209,8 @@ static int pcomp(const void *p, const void *q)
 		if (page1->enc[0]=='(' || page2->enc[0]==')') return -1;
 		if (page1->enc[0]==')' || page2->enc[0]=='(') return 1;
 
-		cc=j+strlen(page_compositor);
+		if (p1) cc+=j+strlen(page_compositor);
+		else return 0;
 	}
 
 	return 0;
@@ -248,35 +256,48 @@ int japanese(char *buff)
 
 int chkcontinue(struct page *p, int num)
 {
-	int i,j,cc=0,num1,num2;
-	char buff[16];
+	int i,j,cc=0,num1,num2,k1,k2;
+	char buff1[16],buff2[16],*p0,*p1;
 
-	for (i=0;i<3;i++) {
+	for (i=0;i<PAGE_COMPOSIT_DEPTH;i++) {
 		if ((p[num].attr[i]<0)&&(p[num+1].attr[i]<0)) return 1;
 		else if (p[num].attr[i]!=p[num+1].attr[i]) return 0;
 
-		for (j=cc;j<strlen(p[num].page);j++) {
-			if (strncmp(&p[num].page[j],page_compositor,strlen(page_compositor))==0) break;
+		p0=&p[num].page[cc];
+		p1=strstr(p0, page_compositor);
+		if (p1) {
+			j=p1-p0;
+			k1=j;
+		} else {
+			j=strlen(p0);
+			k1=0;
 		}
-		strncpy(buff,&p[num].page[cc],j);
-		buff[j]='\0';
-		num1=pnumconv(buff,p[num].attr[i]);
-
-		for (j=cc;j<strlen(p[num+1].page);j++) {
-			if (strncmp(&p[num+1].page[j],page_compositor,strlen(page_compositor))==0) break;
+		strncpy(buff1,p0,j);
+		buff1[j]='\0';
+		num1=pnumconv(buff1,p[num].attr[i]);
+
+		p0=&p[num+1].page[cc];
+		p1=strstr(p0, page_compositor);
+		if (p1) {
+			j=p1-p0;
+			k2=j;
+		} else {
+			j=strlen(p0);
+			k2=0;
 		}
-		strncpy(buff,&p[num+1].page[cc],j);
-		buff[j]='\0';
-		num2=pnumconv(buff,p[num+1].attr[i]);
-
-		if (num1==num2 || num1+1==num2) {
-			if (i==2) return 1;
-			if ((p[num].attr[i+1]<0)&&(p[num+1].attr[i+1]<0)) return 1;
-			else return 0;
+		strncpy(buff2,p0,j);
+		buff2[j]='\0';
+		num2=pnumconv(buff2,p[num+1].attr[i]);
+
+		if (k1>0 || k2>0) {
+			if (k1!=k2) return 0;
+			if (strcmp(buff1,buff2)) return 0;
+			cc+=k1+strlen(page_compositor);
+			continue;
 		}
-		else if (num1!=num2) return 0;
 
-		cc=j+strlen(page_compositor);
+		if (num1==num2 || num1+1==num2) return 1;
+		else return 0;
 	}
 
 	return 1;
diff --git a/texk/mendexk/tests/mendex.test b/texk/mendexk/tests/mendex.test
index 1641ee898b..e4b36caa8a 100755
--- a/texk/mendexk/tests/mendex.test
+++ b/texk/mendexk/tests/mendex.test
@@ -28,10 +28,18 @@ cat $srcdir/tests/uni.idx | \
 	$srcdir/tests/uni.idx -o uni.ind3 -t uni.ilg3 \
 	&& diff $srcdir/tests/uni.ind uni.ind3 || exit 1
 
-# test for two-element range suffix_2p
-./mendex -s $srcdir/tests/rangetwo.ist $srcdir/tests/rangetwo.idx \
-	-o rangetwo.ind1 -t rangetwo.ilg \
-	&& diff $srcdir/tests/rangetwo.ind rangetwo.ind1 || exit 1
+# test for range suffix_2p, suffix_3p, suffix_mp
+./mendex -s $srcdir/tests/range1.ist $srcdir/tests/range.idx \
+	-o range1.ind1 -t range1.ilg \
+	&& diff $srcdir/tests/range1.ind range1.ind1 || exit 1
+
+./mendex -s $srcdir/tests/range2.ist $srcdir/tests/range.idx \
+	-o range2.ind1 -t range2.ilg \
+	&& diff $srcdir/tests/range2.ind range2.ind1 || exit 1
+
+./mendex -s $srcdir/tests/range3.ist $srcdir/tests/range.idx \
+	-o range3.ind1 -t range3.ilg \
+	&& diff $srcdir/tests/range3.ind range3.ind1 || exit 1
 
 # test for page_precedence and suffix_3p
 ./mendex -s $srcdir/tests/pprec0.ist $srcdir/tests/pprecA.idx \
diff --git a/texk/mendexk/tests/range.idx b/texk/mendexk/tests/range.idx
new file mode 100644
index 0000000000..e77882010c
--- /dev/null
+++ b/texk/mendexk/tests/range.idx
@@ -0,0 +1,126 @@
+\indexentry{entryA}{1}
+\indexentry{entryA}{2}
+\indexentry{entryA}{iii}
+\indexentry{entryA}{iv}
+\indexentry{entryA}{IX}
+\indexentry{entryA}{X}
+
+\indexentry{entryB}{1}
+\indexentry{entryB}{2}
+\indexentry{entryB}{3}
+\indexentry{entryB}{iii}
+\indexentry{entryB}{iv}
+\indexentry{entryB}{v}
+\indexentry{entryB}{IX}
+\indexentry{entryB}{X}
+\indexentry{entryB}{XI}
+
+\indexentry{entryC}{1}
+\indexentry{entryC}{2}
+\indexentry{entryC}{3}
+\indexentry{entryC}{4}
+\indexentry{entryC|bold}{iii}
+\indexentry{entryC|bold}{iv}
+\indexentry{entryC|bold}{v}
+\indexentry{entryC|bold}{vi}
+\indexentry{entryC}{IX}
+\indexentry{entryC|bold}{X}
+\indexentry{entryC}{XI}
+\indexentry{entryC}{XII}
+
+\indexentry{entryD}{c-1}
+\indexentry{entryD}{c-2}
+\indexentry{entryD}{i-iii}
+\indexentry{entryD}{i-iv}
+\indexentry{entryD}{d-IX}
+\indexentry{entryD}{d-X}
+
+\indexentry{entryE}{c-1}
+\indexentry{entryE}{c-2}
+\indexentry{entryE}{c-3}
+\indexentry{entryE}{i-iii}
+\indexentry{entryE}{i-iv}
+\indexentry{entryE}{i-v}
+\indexentry{entryE}{d-IX}
+\indexentry{entryE}{d-X}
+\indexentry{entryE}{d-XI}
+
+\indexentry{entryF}{C-I}
+\indexentry{entryF}{C-II}
+\indexentry{entryF}{C-III}
+\indexentry{entryF}{C-IV}
+\indexentry{entryF}{V-LIII}
+\indexentry{entryF}{V-LIV}
+\indexentry{entryF}{V-LV}
+\indexentry{entryF}{V-LVI}
+\indexentry{entryF}{D-DI}
+\indexentry{entryF}{D-DII}
+\indexentry{entryF}{D-DIII}
+\indexentry{entryF}{D-DIV}
+
+\indexentry{entryP}{A-a-1-I-iii}
+\indexentry{entryP}{A-a-2-I-iii}
+\indexentry{entryP}{A-a-3-I-iii}
+\indexentry{entryP}{A-a-1-II-iii}
+\indexentry{entryP}{A-a-1-III-iii}
+\indexentry{entryP}{A-a-1-I-iv}
+\indexentry{entryP}{A-a-1-I-v}
+
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-10}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-11}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-14}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-15}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-16}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-22}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-23}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-24}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-25}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-i}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-ii}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-iii}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-iv}
+\indexentry{entryQ}{1-2-3-4-5-6-7-8-9-v}
+
+\indexentry{entryA1|(}{1}
+\indexentry{entryA1|)}{2}
+\indexentry{entryA1|(}{iii}
+\indexentry{entryA1|)}{iv}
+\indexentry{entryA1|(}{IX}
+\indexentry{entryA1|)}{X}
+
+\indexentry{entryB1|(}{1}
+\indexentry{entryB1|)}{3}
+\indexentry{entryB1|(}{iii}
+\indexentry{entryB1|)}{v}
+\indexentry{entryB1|(}{IX}
+\indexentry{entryB1|)}{XI}
+
+\indexentry{entryC1|(}{1}
+\indexentry{entryC1|)}{4}
+\indexentry{entryC1|(bold}{iii}
+\indexentry{entryC1|)}{vi}
+\indexentry{entryC1|(}{IX}
+\indexentry{entryC1|bold}{X}
+\indexentry{entryC1|)}{XII}
+
+\indexentry{entryD1|(}{c-1}
+\indexentry{entryD1|)}{c-2}
+\indexentry{entryD1|(}{i-iii}
+\indexentry{entryD1|)}{i-iv}
+\indexentry{entryD1|(}{d-IX}
+\indexentry{entryD1|)}{d-X}
+
+\indexentry{entryE1|(}{c-1}
+\indexentry{entryE1|)}{c-3}
+\indexentry{entryE1|(}{i-iii}
+\indexentry{entryE1|)}{i-v}
+\indexentry{entryE1|(}{d-IX}
+\indexentry{entryE1|)}{d-XI}
+
+\indexentry{entryF1|(}{C-I}
+\indexentry{entryF1|)}{C-IV}
+\indexentry{entryF1|(}{V-LIII}
+\indexentry{entryF1|)}{V-LVI}
+\indexentry{entryF1|(}{D-DI}
+\indexentry{entryF1|bold}{D-DII}
+\indexentry{entryF1|)}{D-DIV}
diff --git a/texk/mendexk/tests/range1.ind b/texk/mendexk/tests/range1.ind
new file mode 100644
index 0000000000..0dc1d842a9
--- /dev/null
+++ b/texk/mendexk/tests/range1.ind
@@ -0,0 +1,25 @@
+\begin{theindex}
+
+  \item entryA, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryA1, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryB, 1[[sfx mp]], iii[[sfx mp]], IX[[sfx mp]]
+  \item entryB1, 1[[sfx mp]], iii[[sfx mp]], IX[[sfx mp]]
+  \item entryC, 1[[sfx mp]], \bold{iii[[sfx mp]]}, IX, \bold{X}, 
+		XI[[sfx 2p]]
+  \item entryC1, 1[[sfx mp]], \bold{iii[[sfx mp]]}, \bold{X}, 
+		IX[[sfx mp]]
+  \item entryD, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryD1, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryE, c-1[[sfx mp]], d-IX[[sfx mp]], i-iii[[sfx mp]]
+  \item entryE1, c-1[[sfx mp]], d-IX[[sfx mp]], i-iii[[sfx mp]]
+  \item entryF, C-I[[sfx mp]], D-DI[[sfx mp]], V-LIII[[sfx mp]]
+  \item entryF1, C-I[[sfx mp]], \bold{D-DII}, D-DI[[sfx mp]], 
+		V-LIII[[sfx mp]]
+  \item entryP, A-a-1-I-iii[[sfx mp]], A-a-1-II-iii, A-a-1-III-iii, 
+		A-a-2-I-iii, A-a-3-I-iii
+  \item entryQ, 1-2-3-4-5-6-7-8-9-10[[sfx 2p]], 
+		1-2-3-4-5-6-7-8-9-14[[sfx mp]], 
+		1-2-3-4-5-6-7-8-9-22[[sfx mp]], 
+		1-2-3-4-5-6-7-8-9-i[[sfx mp]]
+
+\end{theindex}
diff --git a/texk/mendexk/tests/range1.ist b/texk/mendexk/tests/range1.ist
new file mode 100644
index 0000000000..116c2d8713
--- /dev/null
+++ b/texk/mendexk/tests/range1.ist
@@ -0,0 +1,3 @@
+page_precedence "nrRaA"
+suffix_2p "[[sfx 2p]]"
+suffix_mp "[[sfx mp]]"
diff --git a/texk/mendexk/tests/range2.ind b/texk/mendexk/tests/range2.ind
new file mode 100644
index 0000000000..9e0bd8ce5e
--- /dev/null
+++ b/texk/mendexk/tests/range2.ind
@@ -0,0 +1,26 @@
+\begin{theindex}
+
+  \item entryA, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryA1, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryB, 1[[sfx 3p]], iii[[sfx 3p]], IX[[sfx 3p]]
+  \item entryB1, 1[[sfx 3p]], iii[[sfx 3p]], IX[[sfx 3p]]
+  \item entryC, 1[[delim r]]4, \bold{iii[[delim r]]vi}, IX, \bold{X}, 
+		XI[[sfx 2p]]
+  \item entryC1, 1[[delim r]]4, \bold{iii[[delim r]]vi}, \bold{X}, 
+		IX[[delim r]]XII
+  \item entryD, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryD1, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryE, c-1[[sfx 3p]], d-IX[[sfx 3p]], i-iii[[sfx 3p]]
+  \item entryE1, c-1[[sfx 3p]], d-IX[[sfx 3p]], i-iii[[sfx 3p]]
+  \item entryF, C-I[[delim r]]C-IV, D-DI[[delim r]]D-DIV, 
+		V-LIII[[delim r]]V-LVI
+  \item entryF1, C-I[[delim r]]C-IV, \bold{D-DII}, D-DI[[delim r]]D-DIV, 
+		V-LIII[[delim r]]V-LVI
+  \item entryP, A-a-1-I-iii[[sfx 3p]], A-a-1-II-iii, A-a-1-III-iii, 
+		A-a-2-I-iii, A-a-3-I-iii
+  \item entryQ, 1-2-3-4-5-6-7-8-9-10[[sfx 2p]], 
+		1-2-3-4-5-6-7-8-9-14[[sfx 3p]], 
+		1-2-3-4-5-6-7-8-9-22[[delim r]]1-2-3-4-5-6-7-8-9-25, 
+		1-2-3-4-5-6-7-8-9-i[[delim r]]1-2-3-4-5-6-7-8-9-v
+
+\end{theindex}
diff --git a/texk/mendexk/tests/range2.ist b/texk/mendexk/tests/range2.ist
new file mode 100644
index 0000000000..552e5fb674
--- /dev/null
+++ b/texk/mendexk/tests/range2.ist
@@ -0,0 +1,4 @@
+page_precedence "nrRaA"
+delim_r "[[delim r]]"
+suffix_2p "[[sfx 2p]]"
+suffix_3p "[[sfx 3p]]"
diff --git a/texk/mendexk/tests/range3.ind b/texk/mendexk/tests/range3.ind
new file mode 100644
index 0000000000..f5b5f5268f
--- /dev/null
+++ b/texk/mendexk/tests/range3.ind
@@ -0,0 +1,25 @@
+\begin{theindex}
+
+  \item entryA, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryA1, 1[[sfx 2p]], iii[[sfx 2p]], IX[[sfx 2p]]
+  \item entryB, 1[[sfx 3p]], iii[[sfx 3p]], IX[[sfx 3p]]
+  \item entryB1, 1[[sfx 3p]], iii[[sfx 3p]], IX[[sfx 3p]]
+  \item entryC, 1[[sfx mp]], \bold{iii[[sfx mp]]}, IX, \bold{X}, 
+		XI[[sfx 2p]]
+  \item entryC1, 1[[sfx mp]], \bold{iii[[sfx mp]]}, \bold{X}, 
+		IX[[sfx mp]]
+  \item entryD, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryD1, c-1[[sfx 2p]], d-IX[[sfx 2p]], i-iii[[sfx 2p]]
+  \item entryE, c-1[[sfx 3p]], d-IX[[sfx 3p]], i-iii[[sfx 3p]]
+  \item entryE1, c-1[[sfx 3p]], d-IX[[sfx 3p]], i-iii[[sfx 3p]]
+  \item entryF, C-I[[sfx mp]], D-DI[[sfx mp]], V-LIII[[sfx mp]]
+  \item entryF1, C-I[[sfx mp]], \bold{D-DII}, D-DI[[sfx mp]], 
+		V-LIII[[sfx mp]]
+  \item entryP, A-a-1-I-iii[[sfx 3p]], A-a-1-II-iii, A-a-1-III-iii, 
+		A-a-2-I-iii, A-a-3-I-iii
+  \item entryQ, 1-2-3-4-5-6-7-8-9-10[[sfx 2p]], 
+		1-2-3-4-5-6-7-8-9-14[[sfx 3p]], 
+		1-2-3-4-5-6-7-8-9-22[[sfx mp]], 
+		1-2-3-4-5-6-7-8-9-i[[sfx mp]]
+
+\end{theindex}
diff --git a/texk/mendexk/tests/range3.ist b/texk/mendexk/tests/range3.ist
new file mode 100644
index 0000000000..b751471b43
--- /dev/null
+++ b/texk/mendexk/tests/range3.ist
@@ -0,0 +1,4 @@
+page_precedence "nrRaA"
+suffix_2p "[[sfx 2p]]"
+suffix_3p "[[sfx 3p]]"
+suffix_mp "[[sfx mp]]"
diff --git a/texk/mendexk/tests/rangetwo.idx b/texk/mendexk/tests/rangetwo.idx
deleted file mode 100644
index d941f7e831..0000000000
--- a/texk/mendexk/tests/rangetwo.idx
+++ /dev/null
@@ -1,2 +0,0 @@
-\indexentry{entryA}{1}
-\indexentry{entryA}{2}
diff --git a/texk/mendexk/tests/rangetwo.ind b/texk/mendexk/tests/rangetwo.ind
deleted file mode 100644
index 1119d2fa8e..0000000000
--- a/texk/mendexk/tests/rangetwo.ind
+++ /dev/null
@@ -1,5 +0,0 @@
-\begin{theindex}
-
-  \item entryA, 1[[sfx2p]]
-
-\end{theindex}
diff --git a/texk/mendexk/tests/rangetwo.ist b/texk/mendexk/tests/rangetwo.ist
deleted file mode 100644
index 3e986c8935..0000000000
--- a/texk/mendexk/tests/rangetwo.ist
+++ /dev/null
@@ -1,2 +0,0 @@
-suffix_2p "[[sfx2p]]"
-
diff --git a/texk/mendexk/var.h b/texk/mendexk/var.h
index b538988c9e..d99218f43a 100644
--- a/texk/mendexk/var.h
+++ b/texk/mendexk/var.h
@@ -4,7 +4,7 @@ FILE *efp;
 
 int lines,idxcount,acc=0,reject=0;
 int prange=1,fsti=0,lorder=0,bcomp=0,force=0,fpage=0,gflg=0,verb=1,debug=0;
-int warn=0,scount=0,pattr[3]={0,0,0};
+int warn=0,scount=0,pattr[PAGE_COMPOSIT_DEPTH]={0};
 /* static char roman[]={"ivxlcdm"},Roman[]={"IVXLCDM"}; */
 
 struct index *ind;
diff --git a/texk/mendexk/version.h b/texk/mendexk/version.h
index b3fe113f39..2020406786 100644
--- a/texk/mendexk/version.h
+++ b/texk/mendexk/version.h
@@ -1,2 +1,2 @@
-#define VERSION  "version " PACKAGE_VERSION " [4-Sep-2021]"
+#define VERSION  "version " PACKAGE_VERSION " [18-Sep-2021]"
 #define BUG_ADDRESS "issue@texjp.org"