diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -52,3 +52,8 @@
 
 * Fifth version. Added two new modules Data.Phonetic.Languages.SpecificationsRead and Main. Added an executable pldPL (anologue
 of the pldUkr from r-glpk-phonetic-languages-ukrainian-durations package). 
+
+## 0.5.1.0 -- 2021-04-30
+
+* Fifth version revised A. Added two example files with data syntaxis, first of all useful for the pldPL executable. See README.md.
+Added also README.md file with a brief description of the possible scenario of the usage for pldPL. Some code improvements. 
diff --git a/Data/Phonetic/Languages/SpecificationsRead.hs b/Data/Phonetic/Languages/SpecificationsRead.hs
--- a/Data/Phonetic/Languages/SpecificationsRead.hs
+++ b/Data/Phonetic/Languages/SpecificationsRead.hs
@@ -29,6 +29,6 @@
   where (css,dss) = span (charLine c) xs
 
 getGWritingSystem :: Char -> String -> GWritingSystemPRPLX
-getGWritingSystem c xs = map ((\(t1,t2) -> (map (\kt -> fromJust (readPEMaybe kt::Maybe PhoneticsRepresentationPLX)) t2,
+getGWritingSystem c xs = map ((\(t1,t2) -> (sort . map (\kt -> fromJust (readPEMaybe kt::Maybe PhoneticsRepresentationPLX)) $ t2,
          read (concat t1)::Int8)) . splitAt 1) . groupBetweenChars c . lines $ xs
 
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,52 @@
+The executable pldPL is intended to use the functionality of the :
+
+1) R programming language https://www.r-project.org/
+
+2) Rglpk library https://cran.r-project.org/web/packages/Rglpk/index.html
+
+3) GNU GLPK library https://www.gnu.org/software/glpk/glpk.html
+
+For more information, please, see the documentation for them.
+
+* Some examples.
+
+Let in the file words.txt you have the (phonetic language) words and their durations in seconds as pairs separated with whitespace 
+at the lines.
+
+Also let in the file controlData.txt you have control specifications, an example of syntaxis for which is in the file
+controlDataExample.txt.
+
+Also let in the file gwrsys.txt you have GWritingSystemPRPLX specifications, an example of syntaxis for which is in the
+file gwrsysExample.txt.
+
+Then the following commands can be variants of the usage of the pldPL executable. 
+
+1) pldPL 0.001 0.001 0.01 0.02 words.txt controlData.txt gwrsys.txt 0.3 0.2 0.02 0.06 1.8 -1 0.01 0.01 1.5 1.5 1.5 1.5 1.5 1.5 | R --quiet --no-save 
+
+This variant tries to minimize the duration of the only one element belonging to the special phonetic language representation
+elements (-1 as the second parameter after the file name), tries 
+to reduce the influence of the two other elements (the third and the fourth parameters as 0.01) and tries to somewhat 
+make longer the 6 vowels (all the consonants have by that the default coefficients equal to 1.0) (a simple example, though
+the program supports also the more complicated ones).
+
+2) pldPL 0.001 0.001 0.01 0.02 words.txt controlData.txt gwrsys.txt 0.3 0.2 0.02 0.06 1.8 -1 0.01 0.01 2.5 2.5 2.5 2.5 2.5 2.5 | R --quiet --no-save 
+
+The same as the 1), but with more prolongation of the vowels.
+
+3) pldPL 0.001 0.001 0.01 0.02 words.txt controlData.txt gwrsys.txt 0.3 0.2 0.02 0.06 1.4 -1 0.01 0.01 2.5 2.5 2.5 2.5 2.5 2.5 | R --quiet --no-save 
+
+If the 2) gives you the not NULL result, then it is recommended to minimize the first parameter after the file name. 
+
+4) pldPL 0.001 0.001 0.01 0.02 words.txt controlData.txt gwrsys.txt 0.3 0.2 0.02 0.06 1.6 -1 0.01 0.01 2.5 2.5 2.5 2.5 2.5 2.5 | R --quiet --no-save 
+
+If the previous gives NULL result, then try to somewhat increase the first parameter after the file name.
+
+Therefore, using such a binary search for the single parameter above, try to find out the more precise value of the point where
+the pldPL gives not NULL result and then use the obtained result as the durations for the system of phonetic languages representations.
+
+It is needed to be said that if omitted, the durations coefficients are equal to the default 1.0.
+
+An example of the pldPL functionality already in use is the pldUkr executable of the
+r-glpk-phonetic-languages-ukrainian-durations package. For more information, please,
+refer to: https://hackage.haskell.org/package/r-glpk-phonetic-languages-ukrainian-durations
+
diff --git a/controlDataExample.txt b/controlDataExample.txt
new file mode 100644
--- /dev/null
+++ b/controlDataExample.txt
@@ -0,0 +1,13 @@
+nn
+PairwisePL_{1}
+PairwisePL_{2}
+...
+.
+.
+.
+PairwisePL_{k}
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+[(Int,Int)]
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+[Int]
+[Int]
diff --git a/gwrsysExample.txt b/gwrsysExample.txt
new file mode 100644
--- /dev/null
+++ b/gwrsysExample.txt
@@ -0,0 +1,33 @@
+n_max
+PhoneticRepresentationPLX_{1,n_max}
+PhoneticRepresentationPLX_{2,n_max}
+...
+.
+.
+.
+PhoneticRepresentationPLX_{k_n_max,n_max}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+n_max - 1
+PhoneticRepresentationPLX_{1,n_max - 1}
+PhoneticRepresentationPLX_{2,n_max - 1}
+...
+.
+.
+.
+PhoneticRepresentationPLX_{m_n_max,n_max - 1}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+...
+.
+.
+.
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+0
+PhoneticRepresentationPLX_{1,0}
+PhoneticRepresentationPLX_{2,0}
+...
+.
+.
+.
+PhoneticRepresentationPLX_{p_n_max,0}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
diff --git a/phonetic-languages-phonetics-basics.cabal b/phonetic-languages-phonetics-basics.cabal
--- a/phonetic-languages-phonetics-basics.cabal
+++ b/phonetic-languages-phonetics-basics.cabal
@@ -3,7 +3,7 @@
 -- http://haskell.org/cabal/users-guide/
 
 name:                phonetic-languages-phonetics-basics
-version:             0.5.0.0
+version:             0.5.1.0
 synopsis:            A library for working with generalized phonetic languages usage.
 description:         There already exists a Ukrainian implementation for the phonetic languages approach published at: https://hackage.haskell.org/package/phonetic-languages-simplified-examples-array. It is optimized for the Ukrainian only and needs to be rewritten for every new language mostly from scratch using it as a template. To avoid this boilerplate, this one is provided. It can be used for different languages and even for music or other fields. Now it combines the functionality of the @r-glpk-phonetic-languages-ukrainian-durations@ and  some dependencies of the mentioned one.
 homepage:            https://hackage.haskell.org/package/phonetic-languages-phonetics-basics
@@ -14,7 +14,7 @@
 copyright:           Oleksandr Zhabenko
 category:            Language, Math, Game
 build-type:          Simple
-extra-source-files:  ChangeLog.md
+extra-source-files:  ChangeLog.md, README.md, controlDataExample.txt, gwrsysExample.txt
 cabal-version:       >=1.10
 
 library