diff --git a/src/GF/Canon/GFCC/GenGFCC.hs b/src/GF/Canon/GFCC/GenGFCC.hs
index f1d4e8923..cd15ae9cf 100644
--- a/src/GF/Canon/GFCC/GenGFCC.hs
+++ b/src/GF/Canon/GFCC/GenGFCC.hs
@@ -2,7 +2,7 @@ module GF.Canon.GFCC.GenGFCC where
 
 import GF.Canon.GFCC.DataGFCC
 import GF.Canon.GFCC.AbsGFCC
-import GF.Data.Operations
+
 import qualified Data.Map as M
 import System.Random
 
@@ -26,6 +26,11 @@ generate gfcc cat = concatMap (\i -> gener i cat) [0..]
     Tr _ [] -> 1
     Tr _ ts -> maximum (map depth ts) + 1
 
+combinations :: [[a]] -> [[a]]
+combinations t = case t of 
+  []    -> [[]]
+  aa:uu -> [a:u | a <- aa, u <- combinations uu]
+
 -- generate an infinite list of trees randomly
 generateRandom :: StdGen -> GFCC -> CId -> [Exp]
 generateRandom gen gfcc cat = genTrees (randomRs (0.0, 1.0) gen) cat where
diff --git a/src/GF/Infra/Print.hs b/src/GF/Infra/Print.hs
index c4a310c29..17f2c2188 100644
--- a/src/GF/Infra/Print.hs
+++ b/src/GF/Infra/Print.hs
@@ -121,4 +121,7 @@ instance Print CFFun where
 instance Print Exp where
     prt = P.printTree
 
+instance Print a => Print (Err a) where
+    prt (Ok a) = prt a
+    prt (Bad str) = str
 
diff --git a/src/GF/Infra/PrintClass.hs b/src/GF/Infra/PrintClass.hs
index 93d7366b6..5e94984a6 100644
--- a/src/GF/Infra/PrintClass.hs
+++ b/src/GF/Infra/PrintClass.hs
@@ -1,7 +1,6 @@
 module GF.Infra.PrintClass where
 
 import Data.List (intersperse)
-import GF.Data.Operations (Err(..))
 
 class Print a where
     prt :: a -> String
@@ -50,7 +49,3 @@ instance Print Integer where
 instance Print a => Print (Maybe a) where
     prt (Just a) = prt a
     prt Nothing  = "Nothing"
-
-instance Print a => Print (Err a) where
-    prt (Ok a) = prt a
-    prt (Bad str) = str