ddddddddddddddd
dddddddddd
ddddddddddd
cccccccccccccccccccccc
ddddddddddddddddd
dddddddddddd
vvvvvvvvvvvvvvvvvvvvv
ccccccccccccccc
nnnnnnnnnnnnnn
ccccccccccccccccccccccccccc