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diff --git a/Haskell-book/09/src/SquareCube.purs b/Haskell-book/09/src/SquareCube.purs
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+module SquareCube where
+
+import Control.MonadZero (guard)
+import Data.Array ((..))
+import Data.Int (pow)
+import Data.Tuple (Tuple(..))
+import Prelude
+
+mySqr :: Array Int
+mySqr = do
+  x <- 1 .. 5
+  pure $ pow x 2
+
+myCube :: Array Int
+myCube = do
+  y <- 1 .. 5
+  pure $ pow y 3
+
+mySqrCube :: Array (Tuple Int Int)
+mySqrCube = do
+  x <- mySqr
+  y <- myCube
+  guard $ x < 50
+  guard $ y < 50
+  pure $ Tuple x y