/usr/share/texmf-texlive/metapost/support/charlib/Fl 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 | % $Id: Fl,v 1.2 2004/09/19 21:47:11 karl Exp $
% Public domain.
vardef C.Fl(expr n) =
save p;
picture p; p="f"infont n;
for c="f","l":
addto p also c infont n shifted(xpart urcorner p-fontsize n/20,0);
endfor
p enddef;
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