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  1. or download this
    sub foo {
  return shift->{some_obj}->some_method ? 1 : undef;
}
  2. or download this
    s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)