pub fn list() -> Vec<String> {
let consonants = "qwrtpsdfgjklzxcvbnm";
let vowels = "aeiou";
let mut lst = Vec::new();
for c in consonants.chars() {
for v in vowels.chars() {
lst.push(c.to_string() + &v.to_string());
lst.push(v.to_string() + &c.to_string());
}
}
return lst;
}