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  1. or download this
    my $n = 4;
for my $i (1..2**$n-1) {
...
        } # end-if
    } # end-for
} # end-for
  2. or download this
    if ($i & 2**$j) {
} # end-if
  3. or download this
    if ($i == 2**$j) {
} # end-if