listenpermutierer_revisited.py

import itertools

def listen_permutator(a,b):
    comb = itertools.product(a,b)
    comb = [flatten([j for j in i]) for i in comb]
    #print(list(comb))
    comb = set(tuple(sorted(i)) for i in comb if len(i) == len(set(i)))
    return [list(i) for i in comb]

def flatten(l): 
    return flatten(l[0]) + (flatten(l[1:]) if len(l) > 1 else []) if type(l) is list else [l]
  
a = [1,2,3]
b = [1,1,6]
c = [7,8,9]
d = [10,11,12]

x = listen_permutator(a,b)
y = listen_permutator(x,c)
z = listen_permutator(y,d)