[Haskell-cafe] Re: Solution to Thompson's Exercise 4.4

Thanks to all the replies! It seems that there are ways to solve the exercise if I use constructs that are found in later chapters of the book. Sean could be right in that some of the exercises are meant to be difficult to solve and they prepare you for later chapters. Tried Gour's suggestion, but didn't work for howManyOfFourEqual 4 4 2 2 = 3 Anyway the approach was similar to mine, and if I use isEqual I could get a simpler solution. Thanks again. -- Kaoru Hosokawa khosokawa@gmail.com