/usr/share/texmf-texlive/metapost/support/charlib/12 is in texlive-metapost 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | % $Id: 12,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
vardef C.xii(expr n) =
save s,t,p,q;
q=fontsize n;
def s=infont "Times" scaled(q/fontsize"Times"/2)enddef;
def t=shifted(xpart urcorner p,0)enddef;
picture p; p="1"s shifted(0,q/3);
addto p also char164 s scaled2 t;
addto p also "2"s t;
p enddef;
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