COPYFROM 23
COPYTO   20
COPYTO   21
COPYFROM 24
COPYTO   22

first:
INBOX
JUMPZ  second
COPYTO [23]
BUMPUP 23
JUMP   first

second:
INBOX
JUMPZ  compare
COPYTO [24]
BUMPUP 24
JUMP   second

compare:
COPYFROM [22]
SUB      [21]
JUMPN    o2
COPYFROM [21]
SUB      [22]
JUMPN    o1
BUMPUP   20
BUMPUP   21
SUB      23
JUMPZ    o1
BUMPUP   22
SUB      24
JUMPZ    o2
JUMP     compare

o1:
COPYFROM 21
SUB      20
COPYTO   21
o11:
SUB      23
JUMPZ    end
COPYFROM [21]
OUTBOX
BUMPUP   21
JUMP     o11

o2:
COPYFROM 22
SUB      20
COPYTO   22
o22:
SUB      24
JUMPZ    end
COPYFROM [22]
OUTBOX
BUMPUP   22
JUMP     o22

end: