diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -50,3 +50,7 @@
 module. Added also validOrdStr to the export list in the module. Some minor documentation
 improvements. 
 
+## 0.6.1.1 -- 2023-05-23
+
+* Sixth version revised B. Some minor code improvements.
+
diff --git a/Phladiprelio/ConstraintsEncoded.hs b/Phladiprelio/ConstraintsEncoded.hs
--- a/Phladiprelio/ConstraintsEncoded.hs
+++ b/Phladiprelio/ConstraintsEncoded.hs
@@ -10,7 +10,7 @@
 -- Provides a way to encode the needed constraint with possibly less symbols.
 -- Uses arrays instead of vectors.
 
-{-# LANGUAGE FlexibleInstances, FlexibleContexts, NoImplicitPrelude #-}
+{-# LANGUAGE FlexibleInstances, FlexibleContexts, NoImplicitPrelude, BangPatterns #-}
 
 module Phladiprelio.ConstraintsEncoded (
   -- * Data types
@@ -198,8 +198,8 @@
 -- | Can be thought of as 'filter' ('generalConversion' ... ) @<arrays>@ but is somewhat more efficient.
 filterGeneralConv :: Int -> String -> [Array Int Int] -> [Array Int Int]
 filterGeneralConv m cnstrns xs 
-  | validOrdStr cnstrns = 
-    filter (\arr -> (\ks -> if ks == "True" || ks == "E" then True else False) . head . head . dropWhile ((/= 1) . length) . drop 1 . iterate (oneChange m arr) . stage1Parsing $ cnstrns) xs
+  | validOrdStr cnstrns = let !xss = stage1Parsing cnstrns in  
+    filter (\arr -> (\ks -> if ks == "True" || ks == "E" then True else False) . head . head . dropWhile ((/= 1) . length) . drop 1 . iterate (oneChange m arr) $ xss) xs
   | otherwise = []
 {-# INLINE filterGeneralConv #-}
 
diff --git a/phonetic-languages-constraints-array.cabal b/phonetic-languages-constraints-array.cabal
--- a/phonetic-languages-constraints-array.cabal
+++ b/phonetic-languages-constraints-array.cabal
@@ -2,7 +2,7 @@
 -- For further documentation, see http://haskell.org/cabal/users-guide/
 
 name:                phonetic-languages-constraints-array
-version:             0.6.1.0
+version:             0.6.1.1
 synopsis:            Constraints to filter the needed permutations
 description:         Provides several the most important variants of constraints. Can be used with the phonetic-languages-common series of package. Instead of vectors, uses arrays.
 homepage:            https://hackage.haskell.org/package/phonetic-languages-constraints-array