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  1. or download this
    perl -MStorable -ne 's/(.)/\{$1\}/g;eval­("\$x$_\{­EOS}=0");END{sto­re
    +(\%x,out­put)}'
    #              (Perl not sed)^       prettier^^^  bug^^   ^^^^was quit
    +e wasteful
    
  2. or download this
    perl -MStorable -ne '$p=\%t;$p=$p->{$_}||={}for/./gs;END{sto­re(\%t,ou
    +t­put)}'
    
  3. or download this
    grep '^s\?[hk]\?[ei][ln][tlk]y\?$' /usr/share/dict/words | perl -MData
    +::Dumper -ne '$p=\\%t;$p=\$$p->{$_}for/./gs;$$p=0;END{print Data::Dum
    +per->new([\%t])->Terse(1)->Indent(1)->Sortkeys(1)->Useqq(1)->Dump()}'
    + | less