Ruudukko

params = input().split("\n")

n = int(params[0])
strings = params[1:]

# sort into arrays based on length
harmonic_potential = {}

for string in strings:
    str_len = len(string)
    if not str_len in harmonic_potential:
        harmonic_potential[str_len] = []
    harmonic_potential[str_len].append(string)

harmonic_count = 0
harmonics = []

for str_list in harmonic_potential.values():
    for index, string in enumerate(str_list):

        same_char = []  #   [ [pos1, pos2] ]
        diff_char = []

        for pos, char in enumerate(string):
            for other_pos in range(pos + 1, len(string)):
                other_char = string[other_pos]
                if char == other_char:
                    same_char.append([pos, other_pos])
                else:
                    diff_char.append([pos, other_pos])

        for other_index in range(index + 1, len(str_list)):
            other_string = str_list[other_index]
            if other_index != index:
                is_harmonic = True
                for same_char_info in same_char:
                    pos0 = same_char_info[0]
                    pos1 = same_char_info[1]
                    if other_string[pos0] != other_string[pos1]:
                        is_harmonic = False
                        break
                for diff_char_info in diff_char:
                    pos0 = diff_char_info[0]
                    pos1 = diff_char_info[1]
                    if other_string[pos0] == other_string[pos1]:
                        is_harmonic = False
                        break
                if is_harmonic:
                    harmonic_count += 1
                    harmonics.append((string, other_string))

print(harmonic_count)
#print(harmonics)

# 6 AAB ABKA SSG TSGT ZZZZ KEAK

# 10 AB CD AAB DDS EET QWEE RRTA EIOP PPAB IPAA
# 4

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER