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  1. or download this
    sub mc_sym {
  \%{{map{(reverse eq$_&&($x=$_*$_)eq reverse$x)?($_,$x):()}1..pop}}
}
  2. or download this
    sub mc_sym {
  +{map{(reverse==$_&&($x=$_*$_)==reverse$x)?($_,$x):()}1..pop}
}
  3. or download this
    sub mc_sym {
  +{map{(reverse^$_||($x=$_*$_)^reverse$x)?():($_,$x)}1..pop}
}