diff --git a/CHANGELOG.md b/CHANGELOG.md
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+# Revision history for subG
+
+## 0.1.0.0 -- 2020-10-16
+
+* First version. Released on an unsuspecting world.
diff --git a/Data/SubG.hs b/Data/SubG.hs
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+++ b/Data/SubG.hs
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+-- |
+-- Module      :  Data.SubG
+-- Copyright   :  (c) OleksandrZhabenko 2020
+-- License     :  MIT
+-- Stability   :  Experimental
+-- Maintainer  :  olexandr543@yahoo.com
+--
+-- 
+
+{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances #-}
+
+module Data.SubG (
+  subG
+  , dropWhile
+  , takeWhile
+  , span
+  , preAppend
+) where
+
+import Prelude hiding (dropWhile, span, takeWhile)
+import qualified Data.Foldable as F
+import Data.Monoid
+
+infixr 1 %@, %^  
+
+class (Foldable t, Eq a, Eq (t a)) => InsertLeft t a where
+  (%@) :: a -> t a -> t a  -- infixr 1
+  (%^) :: t a -> t (t a) -> t (t a)
+
+instance (Eq a) => InsertLeft [] a where
+  (%@) = (:)
+  (%^) = (:)
+
+-- | Inspired by: 'https://hackage.haskell.org/package/base-4.14.0.0/docs/src/Data.OldList.html#words'
+-- and Graham Hutton. A tutorial on the universality and expressiveness of fold. J. Functional Programming 9 (4): 355–372, July 1999.
+-- that is available at the URL: 'https://www.cs.nott.ac.uk/~pszgmh/fold.pdf'.
+subG :: (InsertLeft t a, Monoid (t a), Monoid (t (t a))) => t a -> t a -> t (t a)
+subG whspss xs = if F.null ts then mempty else w %^ subG whspss s''
+     where ts = dropWhile (`F.elem` whspss) xs
+           (w, s'') = span (`F.notElem` whspss) ts
+
+dropWhile' :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> (t a, t a)
+dropWhile' p = F.foldr f v
+  where f x (ys, xs) = (if p x then ys else x %@ xs, x %@ xs)
+        v = (mempty,mempty)
+
+dropWhile :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> t a        
+dropWhile p = fst . dropWhile' p
+
+span :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> (t a, t a)
+span p = fst . span' p
+
+span' :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> ((t a, t a), t a)
+span' p = F.foldr f v
+  where f x ((ys, zs), xs) = (if p x then (x %@ ys, zs) else (mempty,x %@ xs), x %@ xs)
+        v = ((mempty, mempty), mempty)
+
+takeWhile :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> t a
+takeWhile p = fst . takeWhile' p
+
+takeWhile' :: (InsertLeft t a, Monoid (t a)) => (a -> Bool) -> t a -> (t a, t a)
+takeWhile' p = F.foldr f v
+  where f x (ys,xs) = (if p x then x %@ ys else mempty, x %@ xs)
+        v = (mempty,mempty)
+
+-- | Prepends and appends the given two first arguments to the third one.
+preAppend :: (InsertLeft t a, Monoid (t (t a))) => t a -> t (t a) -> t (t a) -> t (t a)
+preAppend ts uss tss = mconcat [ts %^ tss, uss]
+{-# INLINE preAppend #-}
+
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright (c) 2020 OleksandrZhabenko
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/Setup.hs b/Setup.hs
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+++ b/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/subG.cabal b/subG.cabal
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--- /dev/null
+++ b/subG.cabal
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+-- Initial subG.cabal generated by cabal init.  For further documentation,
+-- see http://haskell.org/cabal/users-guide/
+
+name:                subG
+version:             0.1.0.0
+synopsis:            Some extension to the Foldable and Monoid classes.
+description:         Some extension to the Foldable and Monoid classes. Introduces a new class InsertLeft of the types that can be inserted with values from the left.
+homepage:            https://hackage.haskell.org/package/subG
+license:             MIT
+license-file:        LICENSE
+author:              OleksandrZhabenko
+maintainer:          olexandr543@yahoo.com
+copyright:           Oleksandr Zhabenko
+category:            Data, Development
+build-type:          Simple
+extra-source-files:  CHANGELOG.md
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Data.SubG
+  -- other-modules:
+  other-extensions:    MultiParamTypeClasses, FlexibleInstances
+  build-depends:       base >=4.7 && <4.15
+  -- hs-source-dirs:
+  default-language:    Haskell2010