Unique Rotational Cards with Four Elements

#Generate all possible cards
sides = [1,2,3,4]

combinations = []

for a in sides:
    for b in sides:
        for c in sides:
            for d in sides:
                combinations.append([a,b,c,d])

# Remove all dupes
dupes = []
for combo in combinations:
    for side in sides:   
        if combo.count(side) >= 3:
            dupes.append(combo)
            break

for dupe in dupes:
    combinations.remove(dupe)

# Remove cards with rotation symmetry
unique = []
checked = []

def is_symmetrical(a,b):
    for i in range(4):
        _tmp = b[0]
        b[0] = b[1]
        b[1] = b[2]
        b[2] = b[3]
        b[3] = _tmp
        if a==b:
            return True
    return False

for i in range(len(combinations)):
    _cursor = combinations[i]
    if _cursor in checked:
        continue
    else:
        unique.append(_cursor)
        if i == len(combinations) - 1:
            break
        for j in range(i+1, len(combinations)):
            if is_symmetrical(_cursor, combinations[j]):
                checked.append(combinations[j])

with open('cards.txt', 'w') as f:
    for combo in unique:
        f.write(str(combo))
        f.write('\n')

# [1, 1, 2, 2]
# [1, 1, 2, 3]
# [1, 1, 2, 4]
# [1, 1, 3, 2]
# [1, 1, 3, 3]
# [1, 1, 3, 4]
# [1, 1, 4, 2]
# [1, 1, 4, 3]
# [1, 1, 4, 4]
# [1, 2, 1, 2]
# [1, 2, 1, 3]
# [1, 2, 1, 4]
# [1, 2, 2, 3]
# [1, 2, 2, 4]
# [1, 2, 3, 2]
# [1, 2, 3, 3]
# [1, 2, 3, 4]
# [1, 2, 4, 2]
# [1, 2, 4, 3]
# [1, 2, 4, 4]
# [1, 3, 1, 3]
# [1, 3, 1, 4]
# [1, 3, 2, 2]
# [1, 3, 2, 3]
# [1, 3, 2, 4]
# [1, 3, 3, 2]
# [1, 3, 3, 4]
# [1, 3, 4, 2]
# [1, 3, 4, 3]
# [1, 3, 4, 4]
# [1, 4, 1, 4]
# [1, 4, 2, 2]
# [1, 4, 2, 3]
# [1, 4, 2, 4]
# [1, 4, 3, 2]
# [1, 4, 3, 3]
# [1, 4, 3, 4]
# [1, 4, 4, 2]
# [1, 4, 4, 3]
# [2, 2, 3, 3]
# [2, 2, 3, 4]
# [2, 2, 4, 3]
# [2, 2, 4, 4]
# [2, 3, 2, 3]
# [2, 3, 2, 4]
# [2, 3, 3, 4]
# [2, 3, 4, 3]
# [2, 3, 4, 4]
# [2, 4, 2, 4]
# [2, 4, 3, 3]
# [2, 4, 3, 4]
# [2, 4, 4, 3]
# [3, 3, 4, 4]
# [3, 4, 3, 4]

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