#![allow(non_snake_case)]
use std::collections::HashSet;
use proconio::{input, marker::Bytes};

fn main() {
    input! { n: usize, s: [Bytes; n] }
    let mut strs = HashSet::new();
    for i in 0..n {
        for j in 0..n {
            if i != j {
                let mut t = s[i].clone();
                t.append(&mut s[j].clone());
                strs.insert(t);
            }
        }
    }
    let ans = strs.len();
    println!("{ans}");
}