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  1. or download this
    push(@{$a[$_%2]}, substr($b, $_, 1))
       for 0..13;
    
  2. or download this
    push(@{$a[0]}, $b =~ /(.)./g);
    push(@{$a[1]}, $b =~ /.(.)/g);
    
  3. or download this
    my $t = 1;
    push(@{$a[$t ^= 1]}, $_)
       foreach $b =~ /(.)/g;