start:
COPYFROM 24
COPYTO   0
COPYTO   10
BUMPUP   10
BUMPUP   10

INBOX
COPYTO   23

test:
SUB      10
COPYTO   22
JUMPZ    out2
JUMPN    continue
BUMPUP   0
COPYFROM 22
JUMP     test

out2:
COPYFROM 10
OUTBOX
BUMPUP   0
COPYTO   23
COPYFROM 24
COPYTO   0
COPYFROM 23
JUMP     test

continue:
BUMPUP   10
COPYFROM 24
COPYTO   0
BUMPDN   23
JUMPZ    start
BUMPUP   23
JUMP     test