@1
MOV UP ACC
MOV ACC RIGHT
SUB UP
SUB 1
MOV ACC RIGHT

@2
MOV LEFT ACC
JEZ B
A: MOV UP NIL
SUB 1
JNZ A
B: ADD LEFT
C: MOV UP DOWN
ADD 2
JGZ D
MOV UP DOWN
JLZ C
D: MOV UP ACC
JNZ D
MOV ACC DOWN

@6
MOV UP DOWN

@9
MOV UP DOWN
