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  1. or download this
    perl -wle 'print( my $i ** 2 )'
#Use of uninitialized value $i in exponentiation (**) at -e line 1.
#0
  2. or download this
    perl -wle 'print( my ( $i ** 2 ) )'
#Can't declare exponentiation (**) in "my" at -e line 1, near ") )
#"
#Execution of -e aborted due to compilation errors.