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\ProvidesPackage{numending}
\def\numending#1#2#3#4{\ifnum#1>100
\numending{\numexpr#1-100\relax}{#2}{#3}{#4}\else \ifnum#1 < 21
\ifnum#1> 4 #4\else\ifnum#1=1 #2 \else#3\fi\fi\else \ifnum#1 < 31
\numending{\numexpr#1-20\relax}{#2}{#3}{#4}\else
\numending{\numexpr#1-10\relax}{#2}{#3}{#4}\fi\fi\fi}
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