import sys
input = sys.stdin.readline

def to_num(s):
    ret = 0
    for c in s:
        x = ord(c) - ord('0')
        ret *= 5
        ret += x
    return ret


n, m = map(int, input().split())
items = [to_num(input()[:-1]) for _ in [0] * n]

imos = [0] * (5 ** m)
for item in items:
    imos[item] = 1
for i in range(5 ** m):
    for j in range(m):
        x = i - (5 ** j) * (i // (5 ** j) % 5)
        for k in range(3, -1, -1):
            y = x + (5 ** j) * k
            imos[y] += imos[y + 5 ** j]

ans = sum(imos[item] > 1 for item in items)
print(ans)