t = input()

n = int(t.split(" ")[0]) # num of lines
m = int(t.split(" ")[1]) # length of lines

all = []

for x in range(n):
    all.append([*input()])


types = []
type_counter = []


for x in range(n):

    temp_type_counter = type_counter.copy()

    for y in range(len(types)):

        if all[x].copy().sort() != types[y].copy().sort(): continue
        else:
            temp = all[x].copy()

            for z in range(m):
                if temp == types[y]:
                    type_counter[y] = type_counter[y] + 1
                    break
                temp.append(temp[0])
                temp.pop(0)
                
            
    if temp_type_counter == type_counter:
        types.append(all[x])
        type_counter.append(1)



answer = 0

for l in range(len(type_counter)):
    answer = answer + ((type_counter[l]*(type_counter[l]-1))/2)

print(int(answer))