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for my $i ( 0 .. $lengthString - 1 ) { my $char0 = substr( $string0, $i, 1 ); ... my $char3 = substr( $string3, $i, 1 ); } }
for my $i ( 0 .. $lengthString - 1 ) { for my $j (0 .. $numChars - 1){ ... my $char$j = substr( $string$j, $i, 1 ); } }