ttttttttttttttt
ttttttttttttttttttttt
rrrrrrrrrrrrrrrrrrrr
ddddddddddddddddddddd
cvcccccccccccccccccccccccc
nnnnnnnnnnnnnnnnnn
nnnnnnnnnnnnnnnnnnnnnnn
oooooooooooooooooooooo
ttttttttttttttt
ttttttttttttttttttttt
rrrrrrrrrrrrrrrrrrrr
ddddddddddddddddddddd
cvcccccccccccccccccccccccc
nnnnnnnnnnnnnnnnnn
nnnnnnnnnnnnnnnnnnnnnnn
oooooooooooooooooooooo