@1
MOV UP, ACC
MOV ACC, RIGHT
MOV ACC, DOWN

@2
L: MOV LEFT, ACC
MOV -1, DOWN
JNZ L
MOV 1, DOWN

@4
L: MOV UP, ACC
MOV ACC, DOWN
JEZ E
MOV -1, DOWN
JMP L
E: MOV 1, DOWN

@5
MOV -2, ACC
L: ADD 1
JRO UP
MOV ACC, DOWN

@8
L: ADD UP
JRO UP
MOV ACC, DOWN
MOV 0, ACC

@9
MOV UP, DOWN
