def add(x, y):
    return x + y

def product(a, b):
    return a * b

def reversal(word):
    lower_word = word.lower()
    return lower_word[::-1]

def is_palindrom(word):
    lower_word = word.lower()
    return lower_word == lower_word[::-1]

def squared(x):
    return x ** 2
