@0
MOV 4, ACC
I: MOV 0, LEFT
MOV 0, LEFT
SUB 1
JNZ I
L: MOV UP, DOWN
JMP L

@3
M: MOV RIGHT, ACC
MOV ACC, UP
SWP
SUB UP
JLZ P
N: JEZ OP
MOV DOWN, UP
SUB 1
JMP N
P: MOV UP, DOWN
ADD 1
JLZ P
OP: MOV UP, ACC
MOV ACC, RIGHT
MOV RIGHT, UP

@4
S: MOV UP, ACC
MOV UP, LEFT
JNZ R
MOV LEFT, NIL
MOV UP, LEFT
JMP S
R: MOV LEFT, ACC
MOV ACC, DOWN
MOV ACC, LEFT

@7
MOV UP, DOWN
