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diff --git a/sphinx/texinputs/LICRlatin2utf8.xdy b/sphinx/texinputs/LICRlatin2utf8.xdy
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+;; style file for xindy
+;; filename: LICRlatin2utf8.xdy
+;; description: style file for xindy which maps back LaTeX Internal
+;;   Character Representation of letters (as arising in .idx index
+;;   file) to UTF-8 encoding for correct sorting by xindy.
+;; usage: for use with the pdflatex engine,
+;;        *not* for use with xelatex or lualatex.
+;;
+;; This is based upon xindy's distributed file tex/inputenc/utf8.xdy.
+;; The modifications include:
+;;
+;; - Updates for compatibility with current LaTeX macro encoding.
+;;
+;; - Systematic usage of the \IeC {...} mark-up, because mark-up in
+;;   tex/inputenc/utf8.xdy was using it on seemingly random basis, and
+;;   Sphinx coercing of xindy usability for both Latin and Cyrillic scripts
+;;   with pdflatex requires its systematic presence here.
+;;
+;; - Support for some extra letters: Ÿ, Ŋ, ŋ, Œ, œ, Ĳ, ĳ, ȷ and ẞ.
+;;
+;;   Indeed Sphinx needs to support for pdflatex engine all Unicode letters
+;;   available in TeX T1 font encoding.  The above letters are found in
+;;   that encoding but not in the Latin1, 2, 3 charsets which are those
+;;   covered by original tex/inputenc/utf8.xdy.
+;;
+;; - There is a problem that ȷ is not supported out-of-the box by LaTeX
+;;   with inputenc, one must add explicitly
+;;       \DeclareUnicodeCharacter{0237}{\j}
+;;   to preamble of LaTeX document.  However this character is not supported
+;;   by the TeX "times" font used by default by Sphinx for pdflatex engine.
+;;
+;;     **Update**: since LaTeX 2018/12/01, the \j as well as \SS, \k{} and
+;;                  \.{} need no extra user declaration anymore.
+;;
+;; - ẞ needs \DeclareUnicodeCharacter{1E9E}{\SS} (but ß needs no extra set-up).
+;;
+;; - U+02DB (˛) and U+02D9 (˙) are also not supported by inputenc
+;;   out of the box and require
+;;       \DeclareUnicodeCharacter{02DB}{\k{}}
+;;       \DeclareUnicodeCharacter{02D9}{\.{}}
+;;   to be added to preamble.
+;;
+;; - U+0127 ħ and U+0126 Ħ are absent from TeX T1+TS1 font encodings.
+;;
+;; - Characters Ŋ and ŋ are not supported by TeX font "times" used by
+;;   default by Sphinx for pdflatex engine but they are supported by
+;;   some TeX fonts, in particular by the default LaTeX font for T1
+;;   encoding.
+;;
+;; - " and ~ must be escaped as ~" and resp. ~~ in xindy merge rules.
+;;
+;; Contributed by the Sphinx team, July 2018.
+;;
+;; See sphinx.xdy for superior figures, as they are escaped by LaTeX writer.
+(merge-rule "\IeC {\textonesuperior }" "¹" :string)
+(merge-rule "\IeC {\texttwosuperior }" "²" :string)
+(merge-rule "\IeC {\textthreesuperior }" "³" :string)
+(merge-rule "\IeC {\'a}" "á" :string)
+(merge-rule "\IeC {\'A}" "Á" :string)
+(merge-rule "\IeC {\`a}" "à" :string)
+(merge-rule "\IeC {\`A}" "À" :string)
+(merge-rule "\IeC {\^a}" "â" :string)
+(merge-rule "\IeC {\^A}" "Â" :string)
+(merge-rule "\IeC {\~"a}" "ä" :string)
+(merge-rule "\IeC {\~"A}" "Ä" :string)
+(merge-rule "\IeC {\~~a}" "ã" :string)
+(merge-rule "\IeC {\~~A}" "Ã" :string)
+(merge-rule "\IeC {\c c}" "ç" :string)
+(merge-rule "\IeC {\c C}" "Ç" :string)
+(merge-rule "\IeC {\'c}" "ć" :string)
+(merge-rule "\IeC {\'C}" "Ć" :string)
+(merge-rule "\IeC {\^c}" "ĉ" :string)
+(merge-rule "\IeC {\^C}" "Ĉ" :string)
+(merge-rule "\IeC {\.c}" "ċ" :string)
+(merge-rule "\IeC {\.C}" "Ċ" :string)
+(merge-rule "\IeC {\c s}" "ş" :string)
+(merge-rule "\IeC {\c S}" "Ş" :string)
+(merge-rule "\IeC {\c t}" "ţ" :string)
+(merge-rule "\IeC {\c T}" "Ţ" :string)
+(merge-rule "\IeC {\-}" "" :string); soft hyphen
+(merge-rule "\IeC {\textdiv }" "÷" :string)
+(merge-rule "\IeC {\'e}" "é" :string)
+(merge-rule "\IeC {\'E}" "É" :string)
+(merge-rule "\IeC {\`e}" "è" :string)
+(merge-rule "\IeC {\`E}" "È" :string)
+(merge-rule "\IeC {\^e}" "ê" :string)
+(merge-rule "\IeC {\^E}" "Ê" :string)
+(merge-rule "\IeC {\~"e}" "ë" :string)
+(merge-rule "\IeC {\~"E}" "Ë" :string)
+(merge-rule "\IeC {\^g}" "ĝ" :string)
+(merge-rule "\IeC {\^G}" "Ĝ" :string)
+(merge-rule "\IeC {\.g}" "ġ" :string)
+(merge-rule "\IeC {\.G}" "Ġ" :string)
+(merge-rule "\IeC {\^h}" "ĥ" :string)
+(merge-rule "\IeC {\^H}" "Ĥ" :string)
+(merge-rule "\IeC {\H o}" "ő" :string)
+(merge-rule "\IeC {\H O}" "Ő" :string)
+(merge-rule "\IeC {\textacutedbl }" "˝" :string)
+(merge-rule "\IeC {\H u}" "ű" :string)
+(merge-rule "\IeC {\H U}" "Ű" :string)
+(merge-rule "\IeC {\ae }" "æ" :string)
+(merge-rule "\IeC {\AE }" "Æ" :string)
+(merge-rule "\IeC {\textcopyright }" "©" :string)
+(merge-rule "\IeC {\c \ }" "¸" :string)
+(merge-rule "\IeC {\dh }" "ð" :string)
+(merge-rule "\IeC {\DH }" "Ð" :string)
+(merge-rule "\IeC {\dj }" "đ" :string)
+(merge-rule "\IeC {\DJ }" "Đ" :string)
+(merge-rule "\IeC {\guillemotleft }" "«" :string)
+(merge-rule "\IeC {\guillemotright }" "»" :string)
+(merge-rule "\IeC {\'\i }" "í" :string)
+(merge-rule "\IeC {\`\i }" "ì" :string)
+(merge-rule "\IeC {\^\i }" "î" :string)
+(merge-rule "\IeC {\~"\i }" "ï" :string)
+(merge-rule "\IeC {\i }" "ı" :string)
+(merge-rule "\IeC {\^\j }" "ĵ" :string)
+(merge-rule "\IeC {\k {}}" "˛" :string)
+(merge-rule "\IeC {\l }" "ł" :string)
+(merge-rule "\IeC {\L }" "Ł" :string)
+(merge-rule "\IeC {\nobreakspace }" " " :string)
+(merge-rule "\IeC {\o }" "ø" :string)
+(merge-rule "\IeC {\O }" "Ø" :string)
+(merge-rule "\IeC {\textsterling }" "£" :string)
+(merge-rule "\IeC {\textparagraph }" "¶" :string)
+(merge-rule "\IeC {\ss }" "ß" :string)
+(merge-rule "\IeC {\textsection }" "§" :string)
+(merge-rule "\IeC {\textbrokenbar }" "¦" :string)
+(merge-rule "\IeC {\textcent }" "¢" :string)
+(merge-rule "\IeC {\textcurrency }" "¤" :string)
+(merge-rule "\IeC {\textdegree }" "°" :string)
+(merge-rule "\IeC {\textexclamdown }" "¡" :string)
+(merge-rule "\IeC {\texthbar }" "ħ" :string)
+(merge-rule "\IeC {\textHbar }" "Ħ" :string)
+(merge-rule "\IeC {\textonehalf }" "½" :string)
+(merge-rule "\IeC {\textonequarter }" "¼" :string)
+(merge-rule "\IeC {\textordfeminine }" "ª" :string)
+(merge-rule "\IeC {\textordmasculine }" "º" :string)
+(merge-rule "\IeC {\textperiodcentered }" "·" :string)
+(merge-rule "\IeC {\textquestiondown }" "¿" :string)
+(merge-rule "\IeC {\textregistered }" "®" :string)
+(merge-rule "\IeC {\textthreequarters }" "¾" :string)
+(merge-rule "\IeC {\textyen }" "¥" :string)
+(merge-rule "\IeC {\th }" "þ" :string)
+(merge-rule "\IeC {\TH }" "Þ" :string)
+(merge-rule "\IeC {\'I}" "Í" :string)
+(merge-rule "\IeC {\`I}" "Ì" :string)
+(merge-rule "\IeC {\^I}" "Î" :string)
+(merge-rule "\IeC {\~"I}" "Ï" :string)
+(merge-rule "\IeC {\.I}" "İ" :string)
+(merge-rule "\IeC {\^J}" "Ĵ" :string)
+(merge-rule "\IeC {\k a}" "ą" :string)
+(merge-rule "\IeC {\k A}" "Ą" :string)
+(merge-rule "\IeC {\k e}" "ę" :string)
+(merge-rule "\IeC {\k E}" "Ę" :string)
+(merge-rule "\IeC {\'l}" "ĺ" :string)
+(merge-rule "\IeC {\'L}" "Ĺ" :string)
+(merge-rule "\IeC {\textlnot }" "¬" :string)
+(merge-rule "\IeC {\textmu }" "µ" :string)
+(merge-rule "\IeC {\'n}" "ń" :string)
+(merge-rule "\IeC {\'N}" "Ń" :string)
+(merge-rule "\IeC {\~~n}" "ñ" :string)
+(merge-rule "\IeC {\~~N}" "Ñ" :string)
+(merge-rule "\IeC {\'o}" "ó" :string)
+(merge-rule "\IeC {\'O}" "Ó" :string)
+(merge-rule "\IeC {\`o}" "ò" :string)
+(merge-rule "\IeC {\`O}" "Ò" :string)
+(merge-rule "\IeC {\^o}" "ô" :string)
+(merge-rule "\IeC {\^O}" "Ô" :string)
+(merge-rule "\IeC {\~"o}" "ö" :string)
+(merge-rule "\IeC {\~"O}" "Ö" :string)
+(merge-rule "\IeC {\~~o}" "õ" :string)
+(merge-rule "\IeC {\~~O}" "Õ" :string)
+(merge-rule "\IeC {\textpm }" "±" :string)
+(merge-rule "\IeC {\r a}" "å" :string)
+(merge-rule "\IeC {\r A}" "Å" :string)
+(merge-rule "\IeC {\'r}" "ŕ" :string)
+(merge-rule "\IeC {\'R}" "Ŕ" :string)
+(merge-rule "\IeC {\r u}" "ů" :string)
+(merge-rule "\IeC {\r U}" "Ů" :string)
+(merge-rule "\IeC {\'s}" "ś" :string)
+(merge-rule "\IeC {\'S}" "Ś" :string)
+(merge-rule "\IeC {\^s}" "ŝ" :string)
+(merge-rule "\IeC {\^S}" "Ŝ" :string)
+(merge-rule "\IeC {\textasciidieresis }" "¨" :string)
+(merge-rule "\IeC {\textasciimacron }" "¯" :string)
+(merge-rule "\IeC {\.{}}" "˙" :string)
+(merge-rule "\IeC {\textasciiacute }" "´" :string)
+(merge-rule "\IeC {\texttimes }" "×" :string)
+(merge-rule "\IeC {\u a}" "ă" :string)
+(merge-rule "\IeC {\u A}" "Ă" :string)
+(merge-rule "\IeC {\u g}" "ğ" :string)
+(merge-rule "\IeC {\u G}" "Ğ" :string)
+(merge-rule "\IeC {\textasciibreve }" "˘" :string)
+(merge-rule "\IeC {\'u}" "ú" :string)
+(merge-rule "\IeC {\'U}" "Ú" :string)
+(merge-rule "\IeC {\`u}" "ù" :string)
+(merge-rule "\IeC {\`U}" "Ù" :string)
+(merge-rule "\IeC {\^u}" "û" :string)
+(merge-rule "\IeC {\^U}" "Û" :string)
+(merge-rule "\IeC {\~"u}" "ü" :string)
+(merge-rule "\IeC {\~"U}" "Ü" :string)
+(merge-rule "\IeC {\u u}" "ŭ" :string)
+(merge-rule "\IeC {\u U}" "Ŭ" :string)
+(merge-rule "\IeC {\v c}" "č" :string)
+(merge-rule "\IeC {\v C}" "Č" :string)
+(merge-rule "\IeC {\v d}" "ď" :string)
+(merge-rule "\IeC {\v D}" "Ď" :string)
+(merge-rule "\IeC {\v e}" "ě" :string)
+(merge-rule "\IeC {\v E}" "Ě" :string)
+(merge-rule "\IeC {\v l}" "ľ" :string)
+(merge-rule "\IeC {\v L}" "Ľ" :string)
+(merge-rule "\IeC {\v n}" "ň" :string)
+(merge-rule "\IeC {\v N}" "Ň" :string)
+(merge-rule "\IeC {\v r}" "ř" :string)
+(merge-rule "\IeC {\v R}" "Ř" :string)
+(merge-rule "\IeC {\v s}" "š" :string)
+(merge-rule "\IeC {\v S}" "Š" :string)
+(merge-rule "\IeC {\textasciicaron }" "ˇ" :string)
+(merge-rule "\IeC {\v t}" "ť" :string)
+(merge-rule "\IeC {\v T}" "Ť" :string)
+(merge-rule "\IeC {\v z}" "ž" :string)
+(merge-rule "\IeC {\v Z}" "Ž" :string)
+(merge-rule "\IeC {\'y}" "ý" :string)
+(merge-rule "\IeC {\'Y}" "Ý" :string)
+(merge-rule "\IeC {\~"y}" "ÿ" :string)
+(merge-rule "\IeC {\'z}" "ź" :string)
+(merge-rule "\IeC {\'Z}" "Ź" :string)
+(merge-rule "\IeC {\.z}" "ż" :string)
+(merge-rule "\IeC {\.Z}" "Ż" :string)
+;; letters not in Latin1, 2, 3 but available in TeX T1 font encoding
+(merge-rule "\IeC {\~"Y}" "Ÿ" :string)
+(merge-rule "\IeC {\NG }" "Ŋ" :string)
+(merge-rule "\IeC {\ng }" "ŋ" :string)
+(merge-rule "\IeC {\OE }" "Œ" :string)
+(merge-rule "\IeC {\oe }" "œ" :string)
+(merge-rule "\IeC {\IJ }" "Ĳ" :string)
+(merge-rule "\IeC {\ij }" "ĳ" :string)
+(merge-rule "\IeC {\j }" "ȷ" :string)
+(merge-rule "\IeC {\SS }" "ẞ" :string)