diff --git a/lib/model/cryptogram_scheme.dart b/lib/model/cryptogram_scheme.dart
index 098b429..bad6568 100644
--- a/lib/model/cryptogram_scheme.dart
+++ b/lib/model/cryptogram_scheme.dart
@@ -24,11 +24,10 @@ class CryptogramScheme {
           RegExp('sol?', caseSensitive: false): Note.g,
           RegExp('la', caseSensitive: false): Note.a,
           RegExp('(t|s)i', caseSensitive: false): Note.b,
-          RegExp('a', caseSensitive: false): Note.a,
-          RegExp('d', caseSensitive: false): Note.c,
-          RegExp('r', caseSensitive: false): Note.d,
-          RegExp('m', caseSensitive: false): Note.e,
-          RegExp('f', caseSensitive: false): Note.f,
+          RegExp('a', caseSensitive: false): Note.f,
+          RegExp('e', caseSensitive: false): Note.d,
+          RegExp('i', caseSensitive: false): Note.e,
+          RegExp('u', caseSensitive: false): Note.c,
         };
 
   /// Arisen late in the 19th century, it was more akin to normal encipherment.
diff --git a/test/model/cryptogram_string_extension_test.dart b/test/model/cryptogram_string_extension_test.dart
index cc7d097..14b499e 100644
--- a/test/model/cryptogram_string_extension_test.dart
+++ b/test/model/cryptogram_string_extension_test.dart
@@ -6,6 +6,13 @@ void main() {
   group('CryptogramStringExtension', () {
     group('.toCryptogram()', () {
       test('should return the musical cryptogram of this String', () {
+        final herculesDuxFerrarie = 'Hercules Dux Ferrarie'
+            .toCryptogram(CryptogramScheme.solmization());
+        expect(
+          herculesDuxFerrarie,
+          [Note.d, Note.c, Note.d, Note.c, Note.d, Note.f, Note.e, Note.d],
+        );
+
         final arnoldSchonberg =
             'A. SCHBEG'.toCryptogram(CryptogramScheme.german());
         expect(