Trace: BOX
Print
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
BOX
BOX
BOX
BOX
BOX
BOX
BOX
BOX
BOX
BOX
