<wob_jonas> perl -e open$h,"<",($f="wisdom/font");local$/;$_=<$h>; s"& \\S+/twitter\\.com/\\S+""; if (1) { open $o,">",$f;print$o $_; } print;

A free structure is one that has no nontrivial identities, except algebraist phrase that in a much fancier way with morphisms.