answer(trim, "Hello Eyepl").
answer(lower, "hello eyepl").
answer(upper, "HELLO EYEPL").
answer(split, ["red", "green", "blue"]).
answer(join, "red:green:blue").
answer(substring, "cde").
answer(replace, "blue-green-blue").
answer(number_to_string, "42").
answer(string_to_number, 3.5).
answer(atom_string, "eyepl").