Plan 9 from Bell Labs’s /usr/web/sources/contrib/steve/root/sys/lib/texmf/metapost/support/charlib/ob

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Distributed under the MIT License.
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vardef C.ob(expr n) =
 save p; picture p;
 p=nullpicture;
 addto p doublepath makepath pencircle shifted(.5,.5)
  withpen pencircle scaled.0889;
 p scaled(.375*fontsize n)
enddef;

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