Array ( [0] => 11 [1] => 12 [2] => 13 [3] => 14 [4] => 15 [5] => 16 [6] => 17 [7] => 18 [8] => 19 )
Array ( [0] => 11 [1] => 13 [2] => 15 [3] => 17 [4] => 19 )
Array ( [0] => u [1] => v [2] => w [3] => x [4] => y [5] => z )