#!/usr/bin/env python3 from collections import defaultdict INF = 10 ** 16 def main(): N = int(input()) d = defaultdict(int) names = [] for i in range(N): name = input() names.append(name) for i in range(len(name)): g = name[:i] + "*" + name[(i + 1):] d[g] += 1 for name in names: ans = -len(name) for i in range(len(name)): g = name[:i] + "*" + name[(i + 1):] ans += d[g] print(ans) return if __name__ == '__main__': main()