from collections import Counter, defaultdict def main(): ctrs = defaultdict(Counter) N = int(input()) S = [input() for _ in range(N)] for s in S: for mid_idx, letter in enumerate(s): ctrs[(s[:mid_idx], s[mid_idx + 1:])][letter] += 1 for s in S: patterns = 0 for mid_idx, letter in enumerate(s): partial_sum = sum(ctrs[(s[:mid_idx], s[mid_idx + 1:])].values()) patterns += partial_sum - \ ctrs[(s[:mid_idx], s[mid_idx + 1:])][letter] print(patterns) if __name__ == "__main__": main()