X X X X X X X X X X X X X X X X Z X Z Z X X X X X X X X X X X X X X X X X X X X X X X
X X X X X X X X X X X X X X X X Z X Z Z X X X X X X X X X X X X X X X X X X X X X X X with 10 x z a
X X X X X X X X X X X X X X X X Z X Z Z X X X X X X X X X X X X X X X X X X X X X X X with 10 x z a