# copier.tm
# example input: 10010q________

A 0 B X right
A 1 C Y right
B q B q right
B 0 B 0 right
B 1 B 1 right
B _ D 0 left
C q C q right
C 0 C 0 right
C 1 C 1 right
C _ D 1 left
D q D q left
D 0 D 0 left
D 1 D 1 left
D X A 0 right
D Y A 1 right