answer(trim, 'Hello EyeProlog').
answer(lower, 'hello eyeprolog').
answer(upper, 'HELLO EYEPROLOG').
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, eyeprolog).