sub assemble{my($f,$s)=splice(@_,0,2);return$f unless$s; $f=(sort{length($a)<=>length($b)}(c($f,$s),c($s,$f)))[0]; assemble($f,@_)} sub c{($_,$b)=@_;return$_ if/$b/;my $r='';while($b and$r=chop($b).$r and!(index($_,$b)>0)){}$_.$r.(length($b)==1?$b:'')}