#![allow(unused_imports)]
#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(non_snake_case)]
#![allow(special_module_name)]

// use itertools::Itertools;
use proconio::{fastout, input_interactive, marker::Chars};
use std::cmp::{max, min, Reverse};
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};

#[cfg(feature = "local")]
mod lib;

const MOD: i64 = 998244353;
const MOD17: i64 = 1_000_000_007;
const INF: i64 = 1 << 60;

#[fastout]
fn main() {
    input_interactive! {
        n: usize,
        s: [Chars; n]
    }

    let mut set = HashSet::new();
    for i in 0..n {
        for j in 0..n {
            if i == j {
                continue;
            }
            let mut a = s[i].clone();
            let mut b = s[j].clone();
            a.append(&mut b);
            set.insert(a);
        }
    }

    println!("{}", set.len());
}