looks like most of us have some stuttering issue of some sort ...

required/tools/array.dtx

@@ -2613,7 +2613,7 @@
 % it is the equivalent of the primitive "\show" command for macro
 % definitions.  All we need to do is locally redefine "\NC@do" to take
 % its argument (say `C') and then "\show" the (slightly modified)
-% definition of "\NC@rewrite@C". Actually as the the list always
+% definition of "\NC@rewrite@C". Actually as the list always
 % starts off with "\NC@do *" and we do not want to print the
 % definition of the $*$-form, define "\NC@do" to throw away the first
 % item in the list, and then redefine itself to print the rest of the
@@ -2953,7 +2953,7 @@
 %
 %    The problem in this case is that if the optional argument "[b]"
 %    is used we do want the reference point of the tabular be at the
-%    baseline of the last row but at the same time do want the the
+%    baseline of the last row but at the same time do want the
 %    depth of this last line increased by "\extratabsurround" without
 %    changing the placement "\hline".
 %

required/tools/bm.dtx

@@ -1,6 +1,6 @@
 % \iffalse meta-comment
 %
-% Copyright (C) 1993-2019
+% Copyright (C) 1993-2020
 %
 % The LaTeX3 Project and any individual authors listed elsewhere
 % in this file.
@@ -837,7 +837,7 @@
     \let\ifmmode\iftrue
 %    \end{macrocode}
 %    We have to ensure that the math alphabets have definitions that
-%    correspond the the ``bold'' math version we are going to switch
+%    correspond the ``bold'' math version we are going to switch
 %    to. As these definitions are globally assigned when a math
 %    version is changed it is likely that right now we have those of
 %    the normal math version active. Argument |#3| holds either

required/tools/longtable.dtx

@@ -635,9 +635,9 @@
 % "\LTright"&
 %     Glue to the right of the table.          \hfill("\fill")\\
 % "\LTpre"&
-%     Glue before the the table.      \hfill("\bigskipamount")\\
+%     Glue before the table.      \hfill("\bigskipamount")\\
 % "\LTpost"&
-%     Glue after the the table.       \hfill("\bigskipamount")\\
+%     Glue after the table.       \hfill("\bigskipamount")\\
 % "\LTcapwidth"&
 %     The width of a parbox containing the caption.\hfill(4in)\\
 % "LTchunksize"&
@@ -2034,7 +2034,7 @@
 %    \end{macrocode}
 % \end{macro}
 %
-% \subsection{Commands for the the table head and foot}
+% \subsection{Commands for the table head and foot}
 %
 % \begin{macro}{\LT@end@hd@ft}
 % The core of "\endhead" and friends. Store the current chunk in the

required/tools/multicol.dtx

@@ -1339,7 +1339,7 @@
 %    resetting the |\parshape| in case we are inside some list
 %    environment. The correct indentation for the \mc{} environment in
 %    such a case will be produced by moving the result to the right by
-%    |\multicol@leftmargin| later on. If we would use the value of of
+%    |\multicol@leftmargin| later on. If we would use the value of
 %    |\@totalleftmargin| directly then lists inside the \mc{}
 %    environment could cause a shift of the output.
 % \changes{v1.4l}{1992/08/17}{saved \cs{@totalleftmargin}}
@@ -1762,7 +1762,7 @@
   \else
 %    \end{macrocode}
 %    If there was a |\columnbreak| on the very last line all material
-%    will have been moved to the |\colbreak@box|. Thus the the galley
+%    will have been moved to the |\colbreak@box|. Thus the galley
 %    will be empty and no output routine gets called so that the text
 %    is lost. To avoid this problem (though unlikely) we check if the
 %    current galley is empty and the |\colbreak@box| contains text and
@@ -1959,7 +1959,7 @@
 %    \end{macrocode}
 %    To allow checking whether some macro is used within the \mc{}
 %    environment the counter |\col@number| gets a default of |1|
-%    outside the the environment.
+%    outside the environment.
 % \changes{v1.3d}{1991/10/23}{\cs{col@number} set to one}
 % \changes{v1.8o}{2016/02/08}{\cs{col@number} already initialized in the 
 %    kernel, so not initializing it in the package 
@@ -2617,7 +2617,7 @@
        \ifnum\outputpenalty = -\@Mvi
          \mult@info\@ne{End penalty of multicols seen}%
 %    \end{macrocode}
-%    If we are at this point then have have to run the balancing code
+%    If we are at this point then we have to run the balancing code
 %    (which was previously its own output routine). First we pretend
 %    that we had a normal forced breakpoint and then call
 %    |\balance@column@out|. The latter may be let to |\multi@column@out|
@@ -3258,7 +3258,7 @@
 %    If we have unprocessed forced breaks we normally reiterate with a
 %    larger column size to fit them in eventually. However, if there
 %    are simply too many of them (e.g., 3 forced breaks but only 2
-%    columns to balance) then this will never succeed and and we would
+%    columns to balance) then this will never succeed and we would
 %    continue growing the columns until we hit the largest possible
 %    column size. So in addition we check how big the column size is
 %    compared to available room and if we exceed this by
@@ -3455,7 +3455,7 @@
 %    The new release now uses private box registers.
 %
 %    There was in fact a bug in the new implementation because at one
-%    point \LaTeX{} started to use the the extended registers and so
+%    point \LaTeX{} started to use the extended registers and so
 %    jumped from below 255 to above omitting the boxes allocated for
 %    inserts and the output page box.
 %
@@ -3785,7 +3785,7 @@
 %
 %    Special care is needed with handling |\vspace*| as that
 %    corresponds to |\penalty10000|, |\vskip <skip>|, followed by
-%    |\vskip 0pt|. If we see this sequence going backwards in the the
+%    |\vskip 0pt|. If we see this sequence going backwards in the
 %    vertical list we assume that this is a ``desired'' space. We
 %    therefore stop the recursion and reinsert the spaces.
 %
@@ -4344,8 +4344,8 @@
 \newcommand\@docolaction[4][1]{%
 %    \end{macrocode}
 %    
-%   How does the column number get associated with our label? We
-%   do do this by writing another line into the aux file. Here are the
+%    How does the column number get associated with our label? We
+%    do this by writing another line into the aux file. Here are the
 %    preparations.
 %    \begin{macrocode}
  \edef\@docolactioncheck{\write\@auxout

required/tools/tabularx.dtx

@@ -884,7 +884,7 @@
 %
 % Originally I followed Knuth, and had "\def\@tempa{##1}", however this
 % did not allow "#" to appear in the argument. So in v1.04, I changed
-% this to to use a token register, and "\edef". This allows "#" appear,
+% this to use a token register, and "\edef". This allows "#" appear,
 % but makes each one appear twice!, so later we loop through, replacing
 % "##" by "#".
 %    \begin{macrocode}

required/tools/trace.dtx

@@ -493,7 +493,7 @@
 %    turns on tracing of assignments and tracing of
 %    grouping.\footnote{These are my personal preference settings;
 %    \eTeX{} does in fact offer some more tracing switches and perhaps
-%    one or or more of them should be added here as well.}
+%    one or more of them should be added here as well.}
 %    To keep tracing at a minimum |\tracingassigns| should be turned
 %    on last (in fact like before we disassemble |\tracingall|
 %    and reorder it partially).

required/tools/varioref.dtx

@@ -531,7 +531,7 @@
 % \begin{quote}
 %   table 5 on the current \meta{page break} page
 % \end{quote}
-% would would result in an error, which needs to be resolved by the
+% would result in an error, which needs to be resolved by the
 % user by replacing the |\vref| command with an ordinary |\ref| just
 % before the final run.  This is not
 % completely satisfactory but in such case no solution really is.
@@ -1972,7 +1972,7 @@
 %    The \pkg{hyperref} package can then change the meaning of this
 %    command to suppress a hyperlink.
 %
-%    It is is also a good way to check if we are running with a new
+%    It is also a good way to check if we are running with a new
 %    \pkg{varioref} by testing
 %\begin{verbatim}
 %  \ifdefined\vp@gerefstar

required/tools/verbatim.dtx

@@ -1,6 +1,6 @@
 % \iffalse meta-comment
 %
-% Copyright (C) 1993-2019
+% Copyright (C) 1993-2020
 %
 % The LaTeX3 Project and any individual authors listed elsewhere
 % in this file.
@@ -14,7 +14,7 @@
 % The latest version of this license is in
 %    https://www.latex-project.org/lppl.txt
 % and version 1.3c or later is part of all distributions of LaTeX
-% version 2005/12/01 or later.
+% version 2008 or later.
 %
 % The list of all files belonging to the LaTeX `Tools Bundle' is
 % given in the file `manifest.txt'.
@@ -1488,7 +1488,7 @@
   \else
 %    \end{macrocode}
 %    At this point we pass the name of the file to |\@addtofilelist|
-%    so that its appears appears in the output of a |\listfiles|
+%    so that its appears in the output of a |\listfiles|
 %    command.
 % \changes{v1.5j}{1996/09/25}{Add \cs{@addtofilelist} and
 %    \cs{ProvidesFile} so that the name of the file