diff --git a/docs/index.rst b/docs/index.rst
index 0f19a4bf199..d632af2491c 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -13,7 +13,7 @@ Welcome to Python3 solutions for codewars problems's documentation!
    readme
    kyu_2/kyu_2
    kyu_3/kyu_3
-   kyu_4
+   kyu_4/kyu_4
    kyu_5
    kyu_6
    kyu_7
diff --git a/docs/kyu_4.human_readable_duration_format.readme.rst b/docs/kyu_4.human_readable_duration_format.readme.rst
deleted file mode 100644
index 19f0cacdc14..00000000000
--- a/docs/kyu_4.human_readable_duration_format.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/human_readable_duration_format/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.most_frequently_used_words.readme.rst b/docs/kyu_4.most_frequently_used_words.readme.rst
deleted file mode 100644
index fc7f58d780a..00000000000
--- a/docs/kyu_4.most_frequently_used_words.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/most_frequently_used_words/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.next_bigger_number_with_the_same_digits.readme.rst b/docs/kyu_4.next_bigger_number_with_the_same_digits.readme.rst
deleted file mode 100644
index 7e0291ab49f..00000000000
--- a/docs/kyu_4.next_bigger_number_with_the_same_digits.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/next_bigger_number_with_the_same_digits/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.next_smaller_number_with_the_same_digits.readme.rst b/docs/kyu_4.next_smaller_number_with_the_same_digits.readme.rst
deleted file mode 100644
index 5c69350fa53..00000000000
--- a/docs/kyu_4.next_smaller_number_with_the_same_digits.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/next_smaller_number_with_the_same_digits/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.permutations.readme.rst b/docs/kyu_4.permutations.readme.rst
deleted file mode 100644
index 17bb91d8221..00000000000
--- a/docs/kyu_4.permutations.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/permutations/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.range_extraction.readme.rst b/docs/kyu_4.range_extraction.readme.rst
deleted file mode 100644
index 4b7cde6cb79..00000000000
--- a/docs/kyu_4.range_extraction.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/range_extraction/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.strings_mix.readme.rst b/docs/kyu_4.strings_mix.readme.rst
deleted file mode 100644
index 64bdaf6747d..00000000000
--- a/docs/kyu_4.strings_mix.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/strings_mix/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.strip_comments.readme.rst b/docs/kyu_4.strip_comments.readme.rst
deleted file mode 100644
index aa0b1551ad0..00000000000
--- a/docs/kyu_4.strip_comments.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/strip_comments/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sudoku_solution_validator.readme.rst b/docs/kyu_4.sudoku_solution_validator.readme.rst
deleted file mode 100644
index a56a591909c..00000000000
--- a/docs/kyu_4.sudoku_solution_validator.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/sudoku_solution_validator/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sum_by_factors.readme.rst b/docs/kyu_4.sum_by_factors.readme.rst
deleted file mode 100644
index 1b683d91c78..00000000000
--- a/docs/kyu_4.sum_by_factors.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/sum_by_factors/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sum_of_intervals.readme.rst b/docs/kyu_4.sum_of_intervals.readme.rst
deleted file mode 100644
index ff39d6e4116..00000000000
--- a/docs/kyu_4.sum_of_intervals.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/sum_of_intervals/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.the_greatest_warrior.readme.rst b/docs/kyu_4.the_greatest_warrior.readme.rst
deleted file mode 100644
index 1133f42eb7d..00000000000
--- a/docs/kyu_4.the_greatest_warrior.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/the_greatest_warrior/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.validate_sudoku_with_size.readme.rst b/docs/kyu_4.validate_sudoku_with_size.readme.rst
deleted file mode 100644
index b0fa12b8333..00000000000
--- a/docs/kyu_4.validate_sudoku_with_size.readme.rst
+++ /dev/null
@@ -1,5 +0,0 @@
-README
-======
-
-.. include:: ../kyu_4/validate_sudoku_with_size/README.md
-   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.human_readable_duration_format.module.rst b/docs/kyu_4/kyu_4.human_readable_duration_format.module.rst
similarity index 100%
rename from docs/kyu_4.human_readable_duration_format.module.rst
rename to docs/kyu_4/kyu_4.human_readable_duration_format.module.rst
diff --git a/docs/kyu_4/kyu_4.human_readable_duration_format.readme.rst b/docs/kyu_4/kyu_4.human_readable_duration_format.readme.rst
new file mode 100644
index 00000000000..71d1e6de957
--- /dev/null
+++ b/docs/kyu_4/kyu_4.human_readable_duration_format.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/human_readable_duration_format/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.human_readable_duration_format.rst b/docs/kyu_4/kyu_4.human_readable_duration_format.rst
similarity index 100%
rename from docs/kyu_4.human_readable_duration_format.rst
rename to docs/kyu_4/kyu_4.human_readable_duration_format.rst
diff --git a/docs/kyu_4.most_frequently_used_words.module.rst b/docs/kyu_4/kyu_4.most_frequently_used_words.module.rst
similarity index 100%
rename from docs/kyu_4.most_frequently_used_words.module.rst
rename to docs/kyu_4/kyu_4.most_frequently_used_words.module.rst
diff --git a/docs/kyu_4/kyu_4.most_frequently_used_words.readme.rst b/docs/kyu_4/kyu_4.most_frequently_used_words.readme.rst
new file mode 100644
index 00000000000..ec87f7f8410
--- /dev/null
+++ b/docs/kyu_4/kyu_4.most_frequently_used_words.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/most_frequently_used_words/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.most_frequently_used_words.rst b/docs/kyu_4/kyu_4.most_frequently_used_words.rst
similarity index 100%
rename from docs/kyu_4.most_frequently_used_words.rst
rename to docs/kyu_4/kyu_4.most_frequently_used_words.rst
diff --git a/docs/kyu_4.next_bigger_number_with_the_same_digits.module.rst b/docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.module.rst
similarity index 100%
rename from docs/kyu_4.next_bigger_number_with_the_same_digits.module.rst
rename to docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.module.rst
diff --git a/docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.readme.rst b/docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.readme.rst
new file mode 100644
index 00000000000..16f370f50f1
--- /dev/null
+++ b/docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/next_bigger_number_with_the_same_digits/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.next_bigger_number_with_the_same_digits.rst b/docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.rst
similarity index 100%
rename from docs/kyu_4.next_bigger_number_with_the_same_digits.rst
rename to docs/kyu_4/kyu_4.next_bigger_number_with_the_same_digits.rst
diff --git a/docs/kyu_4.next_smaller_number_with_the_same_digits.module.rst b/docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.module.rst
similarity index 100%
rename from docs/kyu_4.next_smaller_number_with_the_same_digits.module.rst
rename to docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.module.rst
diff --git a/docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.readme.rst b/docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.readme.rst
new file mode 100644
index 00000000000..280fc580e2a
--- /dev/null
+++ b/docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/next_smaller_number_with_the_same_digits/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.next_smaller_number_with_the_same_digits.rst b/docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.rst
similarity index 100%
rename from docs/kyu_4.next_smaller_number_with_the_same_digits.rst
rename to docs/kyu_4/kyu_4.next_smaller_number_with_the_same_digits.rst
diff --git a/docs/kyu_4.permutations.module.rst b/docs/kyu_4/kyu_4.permutations.module.rst
similarity index 100%
rename from docs/kyu_4.permutations.module.rst
rename to docs/kyu_4/kyu_4.permutations.module.rst
diff --git a/docs/kyu_4/kyu_4.permutations.readme.rst b/docs/kyu_4/kyu_4.permutations.readme.rst
new file mode 100644
index 00000000000..0e2730dded0
--- /dev/null
+++ b/docs/kyu_4/kyu_4.permutations.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/permutations/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.permutations.rst b/docs/kyu_4/kyu_4.permutations.rst
similarity index 100%
rename from docs/kyu_4.permutations.rst
rename to docs/kyu_4/kyu_4.permutations.rst
diff --git a/docs/kyu_4.range_extraction.module.rst b/docs/kyu_4/kyu_4.range_extraction.module.rst
similarity index 100%
rename from docs/kyu_4.range_extraction.module.rst
rename to docs/kyu_4/kyu_4.range_extraction.module.rst
diff --git a/docs/kyu_4/kyu_4.range_extraction.readme.rst b/docs/kyu_4/kyu_4.range_extraction.readme.rst
new file mode 100644
index 00000000000..54f5657463c
--- /dev/null
+++ b/docs/kyu_4/kyu_4.range_extraction.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/range_extraction/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.range_extraction.rst b/docs/kyu_4/kyu_4.range_extraction.rst
similarity index 100%
rename from docs/kyu_4.range_extraction.rst
rename to docs/kyu_4/kyu_4.range_extraction.rst
diff --git a/docs/kyu_4.readme.rst b/docs/kyu_4/kyu_4.readme.rst
similarity index 56%
rename from docs/kyu_4.readme.rst
rename to docs/kyu_4/kyu_4.readme.rst
index 2a74a39743c..d92d00c959f 100644
--- a/docs/kyu_4.readme.rst
+++ b/docs/kyu_4/kyu_4.readme.rst
@@ -1,5 +1,5 @@
 README
 ======
 
-.. include:: ../kyu_4/README.md
+.. include:: ../../kyu_4/README.md
    :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.rst b/docs/kyu_4/kyu_4.rst
similarity index 100%
rename from docs/kyu_4.rst
rename to docs/kyu_4/kyu_4.rst
diff --git a/docs/kyu_4.snail.module.rst b/docs/kyu_4/kyu_4.snail.module.rst
similarity index 100%
rename from docs/kyu_4.snail.module.rst
rename to docs/kyu_4/kyu_4.snail.module.rst
diff --git a/docs/kyu_4.snail.readme.rst b/docs/kyu_4/kyu_4.snail.readme.rst
similarity index 52%
rename from docs/kyu_4.snail.readme.rst
rename to docs/kyu_4/kyu_4.snail.readme.rst
index 7268c5f2e02..da24038ceb6 100644
--- a/docs/kyu_4.snail.readme.rst
+++ b/docs/kyu_4/kyu_4.snail.readme.rst
@@ -1,5 +1,5 @@
 README
 ======
 
-.. include:: ../kyu_4/snail/README.md
+.. include:: ../../kyu_4/snail/README.md
    :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.snail.rst b/docs/kyu_4/kyu_4.snail.rst
similarity index 100%
rename from docs/kyu_4.snail.rst
rename to docs/kyu_4/kyu_4.snail.rst
diff --git a/docs/kyu_4.strings_mix.module.rst b/docs/kyu_4/kyu_4.strings_mix.module.rst
similarity index 100%
rename from docs/kyu_4.strings_mix.module.rst
rename to docs/kyu_4/kyu_4.strings_mix.module.rst
diff --git a/docs/kyu_4/kyu_4.strings_mix.readme.rst b/docs/kyu_4/kyu_4.strings_mix.readme.rst
new file mode 100644
index 00000000000..9817c306291
--- /dev/null
+++ b/docs/kyu_4/kyu_4.strings_mix.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/strings_mix/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.strings_mix.rst b/docs/kyu_4/kyu_4.strings_mix.rst
similarity index 100%
rename from docs/kyu_4.strings_mix.rst
rename to docs/kyu_4/kyu_4.strings_mix.rst
diff --git a/docs/kyu_4.strip_comments.module.rst b/docs/kyu_4/kyu_4.strip_comments.module.rst
similarity index 100%
rename from docs/kyu_4.strip_comments.module.rst
rename to docs/kyu_4/kyu_4.strip_comments.module.rst
diff --git a/docs/kyu_4/kyu_4.strip_comments.readme.rst b/docs/kyu_4/kyu_4.strip_comments.readme.rst
new file mode 100644
index 00000000000..22879eb3c6d
--- /dev/null
+++ b/docs/kyu_4/kyu_4.strip_comments.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/strip_comments/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.strip_comments.rst b/docs/kyu_4/kyu_4.strip_comments.rst
similarity index 100%
rename from docs/kyu_4.strip_comments.rst
rename to docs/kyu_4/kyu_4.strip_comments.rst
diff --git a/docs/kyu_4.sudoku_solution_validator.module.rst b/docs/kyu_4/kyu_4.sudoku_solution_validator.module.rst
similarity index 100%
rename from docs/kyu_4.sudoku_solution_validator.module.rst
rename to docs/kyu_4/kyu_4.sudoku_solution_validator.module.rst
diff --git a/docs/kyu_4/kyu_4.sudoku_solution_validator.readme.rst b/docs/kyu_4/kyu_4.sudoku_solution_validator.readme.rst
new file mode 100644
index 00000000000..034a178eaa2
--- /dev/null
+++ b/docs/kyu_4/kyu_4.sudoku_solution_validator.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/sudoku_solution_validator/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sudoku_solution_validator.rst b/docs/kyu_4/kyu_4.sudoku_solution_validator.rst
similarity index 100%
rename from docs/kyu_4.sudoku_solution_validator.rst
rename to docs/kyu_4/kyu_4.sudoku_solution_validator.rst
diff --git a/docs/kyu_4.sum_by_factors.module.rst b/docs/kyu_4/kyu_4.sum_by_factors.module.rst
similarity index 100%
rename from docs/kyu_4.sum_by_factors.module.rst
rename to docs/kyu_4/kyu_4.sum_by_factors.module.rst
diff --git a/docs/kyu_4/kyu_4.sum_by_factors.readme.rst b/docs/kyu_4/kyu_4.sum_by_factors.readme.rst
new file mode 100644
index 00000000000..dc4aafba686
--- /dev/null
+++ b/docs/kyu_4/kyu_4.sum_by_factors.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/sum_by_factors/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sum_by_factors.rst b/docs/kyu_4/kyu_4.sum_by_factors.rst
similarity index 100%
rename from docs/kyu_4.sum_by_factors.rst
rename to docs/kyu_4/kyu_4.sum_by_factors.rst
diff --git a/docs/kyu_4.sum_of_intervals.module.rst b/docs/kyu_4/kyu_4.sum_of_intervals.module.rst
similarity index 100%
rename from docs/kyu_4.sum_of_intervals.module.rst
rename to docs/kyu_4/kyu_4.sum_of_intervals.module.rst
diff --git a/docs/kyu_4/kyu_4.sum_of_intervals.readme.rst b/docs/kyu_4/kyu_4.sum_of_intervals.readme.rst
new file mode 100644
index 00000000000..ef20f148148
--- /dev/null
+++ b/docs/kyu_4/kyu_4.sum_of_intervals.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/sum_of_intervals/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.sum_of_intervals.rst b/docs/kyu_4/kyu_4.sum_of_intervals.rst
similarity index 100%
rename from docs/kyu_4.sum_of_intervals.rst
rename to docs/kyu_4/kyu_4.sum_of_intervals.rst
diff --git a/docs/kyu_4.the_greatest_warrior.module.rst b/docs/kyu_4/kyu_4.the_greatest_warrior.module.rst
similarity index 100%
rename from docs/kyu_4.the_greatest_warrior.module.rst
rename to docs/kyu_4/kyu_4.the_greatest_warrior.module.rst
diff --git a/docs/kyu_4/kyu_4.the_greatest_warrior.readme.rst b/docs/kyu_4/kyu_4.the_greatest_warrior.readme.rst
new file mode 100644
index 00000000000..ac7f3d9a3b1
--- /dev/null
+++ b/docs/kyu_4/kyu_4.the_greatest_warrior.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/the_greatest_warrior/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.the_greatest_warrior.rst b/docs/kyu_4/kyu_4.the_greatest_warrior.rst
similarity index 100%
rename from docs/kyu_4.the_greatest_warrior.rst
rename to docs/kyu_4/kyu_4.the_greatest_warrior.rst
diff --git a/docs/kyu_4.validate_sudoku_with_size.module.rst b/docs/kyu_4/kyu_4.validate_sudoku_with_size.module.rst
similarity index 100%
rename from docs/kyu_4.validate_sudoku_with_size.module.rst
rename to docs/kyu_4/kyu_4.validate_sudoku_with_size.module.rst
diff --git a/docs/kyu_4/kyu_4.validate_sudoku_with_size.readme.rst b/docs/kyu_4/kyu_4.validate_sudoku_with_size.readme.rst
new file mode 100644
index 00000000000..11a07c0f40e
--- /dev/null
+++ b/docs/kyu_4/kyu_4.validate_sudoku_with_size.readme.rst
@@ -0,0 +1,5 @@
+README
+======
+
+.. include:: ../../kyu_4/validate_sudoku_with_size/README.md
+   :parser: myst_parser.sphinx_
\ No newline at end of file
diff --git a/docs/kyu_4.validate_sudoku_with_size.rst b/docs/kyu_4/kyu_4.validate_sudoku_with_size.rst
similarity index 100%
rename from docs/kyu_4.validate_sudoku_with_size.rst
rename to docs/kyu_4/kyu_4.validate_sudoku_with_size.rst