>>> "ld!" `isSuffixOf` "Hello World!" True
>>> "World" `isSuffixOf` "Hello World!" False
>>> "Hello" `isPrefixOf` "Hello World!" True
>>> "Hello" `isPrefixOf` "Wello Horld!" False
>>> isInfixOf "Haskell" "I really like Haskell." True
>>> isInfixOf "Ial" "I really like Haskell." False