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  1. or download this
    sub c{@r='';@r=map{$c=$_;map$c.$_,@r}@_ for 1..shift;@r}

sub i{($t=pop)=~s/./.*\Q$&/gs;pop=~/$t/s}
  2. or download this
    sub assemble {
my$n;{for(c($n++,map{split//}@_)){$v=$_;map{i($v,$_)||next}@_;return$_
+}redo}
}
  3. or download this
    print assemble(qw(oa af wf wa));