TOH State Generation

toh_states.py

def unique(iterable):
    # http://stackoverflow.com/questions/6534430/why-does-pythons-itertools-permutations-contain-duplicates-when-the-original
    seen = set()
    for i in iterable:
        if str(i) in seen:
            continue
        seen.add(str(i))
        yield i

states = [i for i in unique(itertools.permutations([[2,1],[],[]]))] + \
             [i for i in unique(itertools.permutations([[2],[1],[]]))] + \
             [i for i in unique(itertools.permutations([[1,2],[],[]]))]