5
(
left
wall

bottom
wall

right
wall

top0
wall

top1
wall

)


10
(
(-1 0 0)
(1 0 0)
(1 1 0)
(0 0.5 0)
(-1 1 0)

(-1 0 0.1)
(1 0 0.1)
(1 1 0.1)
(0 0.5 0.1)
(-1 1 0.1)
)


10
(
((0 1 6) 0)
((0 6 5) 0)

((1 2 7) 1)
((1 7 6) 1)

((2 3 8) 2)
((2 8 7) 2)

((3 4 9) 3)
((3 9 8) 3)

((4 0 5) 4)
((4 5 9) 4)
)

0()

0
(
)


0
(
)


0
(
)