push(@{$a[$_%2]}, substr($b, $_, 1))
   for 0..13;

##</code><code>##

push(@{$a[0]}, $b =~ /(.)./g);
push(@{$a[1]}, $b =~ /.(.)/g);

##</code><code>##

my $t = 1;
push(@{$a[$t ^= 1]}, $_)
   foreach $b =~ /(.)/g;