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3-99 Research/Haskell/Chapter 2 - Starting Out.md

@@ -137,3 +137,10 @@ length' xs = sum [1 | _ <- xs]
 removeNonUppercase st = [ c | c <- st, c `elem` ['A'..'Z']]
 ```
 
+Finally, list comprehensions can be nested. So we can use a comprehension to extract a list from a set of lists, and then use another comprehension on that lsit itself.
+
+## Tuples
+Tuples are somewhat confused with lists, but they are not exactly the same.
+
+Tuples are useful in specific cases. Namely, when an explicit number of elements and their types are known. Tuples are designated by parentheses '()'
+