compare(apple, orange) compare(orange, apple) compare(apple, apple) compare(apple, ) compare(, apple) compare(, ) compare(1, 2) compare(2, 1) compare(1, 1) compare(2, 10) compare(10, 2) compare(1, -1) compare(-1, 1) compare(apple, APPLE) compare(APPLE, apple) compare(cafe, café) compare(café, cafe) compare(small, ) compare(, small) compare(, ) compare(, ) compare(, )