xxxxxxxxxxxxxx
cccccccccccccccccccc
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
cccccccccccccccccccccc
dddddddddddddddddddddd
xxxxxxxxxxxxxxxxx
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
cccccccccccccccccccc
vvvvvvvvvvvvvvvvvvvvvvvvv
dddddddddddddd
cccccccccccccccccc
cccccccccccccccccccccccccc