def sub_lists(my_list):
	from itertools import combinations
	
	subs = []
	for i in range(0, len(my_list)+1):
	  temp = [list(x) for x in combinations(my_list, i)]
	  if len(temp)>0:
	    subs.extend(temp)
	return subs
def sub_lists(Pb2tGGk):
    from itertools import combinations
    subs = []
    for i in range(0, len(Pb2tGGk) + 1):
       
        temp = [list(x) for x in combinations(Pb2tGGk, i)]
        if len(temp) > 0:
            subs.extend(temp)
    return subs