diff --git a/src/cipher_analytical_machine/analyzers/simple_substitution.clj b/src/cipher_analytical_machine/analyzers/simple_substitution.clj
index 4f1d16c..2c03881 100644
--- a/src/cipher_analytical_machine/analyzers/simple_substitution.clj
+++ b/src/cipher_analytical_machine/analyzers/simple_substitution.clj
@@ -7,13 +7,22 @@
   (:gen-class))
 
 (defn get-possible-key-vector
-  "Conver a possible key map to a vector of possible keys. For example, if you have a map: {\\a [\\a \\b \\c] \\b [\\b \\c] \\c [\\a \\c]}, then the vector is [[\\a \\b \\c] [\\b \\c] [\\a \\c]]."
+  "Convert a possible key map to a vector of possible keys. For example, if you have a map: {\\a [\\a \\b \\c] \\b [\\b \\c] \\c [\\a \\c]}, then the vector is [[\\a \\b \\c] [\\b \\c] [\\a \\c]]."
   [possible-key-map symbols]
   (reduce
    (fn [acc el]
      (conj acc (get possible-key-map el)))
    [] symbols))
 
+(defn get-possible-key-vector-from-reversed-count-map
+  "Convert a reversed count map to a vector. Example, from {2 [\\a \\b] 1 [\\d] 3 [\\e]} to [[\\e] [\\a \\b] [\\d]])."
+  [reversed-count-map]
+  (->>  reversed-count-map
+        (into [])
+        (sort-by #(- (first %)))
+        (map second)
+        (into [])))
+
 (defn get-possible-keys
   "Return possible keys for a possible key vector. For example, if you have a map: {\\a [\\a \\b \\c] \\b [\\b \\c] \\c [\\a \\c]}, then the vector is [[\\a \\b \\c] [\\b \\c] [\\a \\c]] and keys (\"aba\" \"abc\" ...)."
   [possible-key-vector]
diff --git a/test/cipher_analytical_machine/analyzers/simple_substitution_test.clj b/test/cipher_analytical_machine/analyzers/simple_substitution_test.clj
index f71ff9b..5b77935 100644
--- a/test/cipher_analytical_machine/analyzers/simple_substitution_test.clj
+++ b/test/cipher_analytical_machine/analyzers/simple_substitution_test.clj
@@ -13,6 +13,13 @@
       {\a [\a \b] \b [\b \a] \c [\a \c]} "abc" [[\a \b] [\b \a] [\a \c]]
       {\a [\a \b] \c [\b \a] \b [\a \c]} "abc" [[\a \b] [\a \c] [\b \a]])))
 
+(deftest get-possible-key-vector-from-reversed-count-map-test
+  (testing ""
+    (are [reversed-count-map expected-key-vector]
+        (= expected-key-vector (get-possible-key-vector-from-reversed-count-map reversed-count-map))
+      {1 [\a \c] 2 [\b]}     [[\b] [\a \c]]
+      {2 [\a] 1 [\b] 3 [\c]} [[\c] [\a] [\b]])))
+
 (deftest get-possible-keys-test
   (testing "The keys must be the all combinations"
     (are [possible-keys-vector expected-keys]