JUMP     init

out:
COPYFROM 0
OUTBOX
COPYFROM 1
OUTBOX
COPYFROM 2
OUTBOX

init:
INBOX
COPYTO   0
INBOX
COPYTO   1
INBOX
COPYTO   2

main:
SUB      0
JUMPN    switch0
a:
COPYFROM 2
SUB      1
JUMPN    switch1
b:
COPYFROM 1
SUB      0
JUMPN    switch
JUMP     out


switch0:
COPYFROM 2
COPYTO   3
COPYFROM 0
COPYTO   2
COPYFROM 3
COPYTO   0
COPYFROM 2
JUMP     a

switch1:
COPYFROM 2
COPYTO   3
COPYFROM 1
COPYTO   2
COPYFROM 3
COPYTO   1
JUMP     b

switch:
COPYFROM 1
COPYTO   3
COPYFROM 0
COPYTO   1
COPYFROM 3
COPYTO   0
JUMP     out