id = 175
number = 10
visible = True
facts = None

solution = '''\
prog_listswap --> [begin], instructs175, [end].

instructs175 --> instr175.
instructs175 --> instr175, instructs175.

instr175 --> [left].
instr175 --> [right].
instr175 --> [swap].
'''

# nothing to do in this exercise
initial = '''\
prog_listswap --> [begin], instructs, [end].

instructs --> instr.
instructs --> instr, instructs.

instr --> [left].
instr --> [right].
instr --> [swap].
'''