Python: find most common element in corresponding two lists

FindMostFrequents.py

import itertools

a = [7, 3]
b = [3, 1, 2]
c = [4, 3, 5]


def allEqual(t):
    same = True
    
    if len(t) == 1:
        return True
    
    if len(t) == 0:
        return False
    
    for i in range(1, len(t)):
        if t[i] != t[i - 1]:
            same = False
            i = len(t) - 1
        else:
            same = same and True
    
    return same


combo = list(itertools.product(a, b, c))
# print list(itertools.permutations(a,2))
# print combo

# combo = [x for x in combo if x[0]==x[1]==x[2]]
# print combo

combo = [x for x in combo if allEqual(x)]
print combo