diff --git a/src/my_project/interviews/top_150_questions_round_22/ex_38_ransom_note.py b/src/my_project/interviews/top_150_questions_round_22/ex_38_ransom_note.py
new file mode 100644
index 00000000..adb3bb13
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_22/ex_38_ransom_note.py
@@ -0,0 +1,11 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def canConstruct(self,ransomNote: str, magazine: str) -> bool:
+
+        for c in set(ransomNote):
+            if ransomNote.count(c) > magazine.count(c):
+                return False 
+            
+        return True 
\ No newline at end of file
diff --git a/src/my_project/interviews/top_150_questions_round_22/ex_39_isomorphic_strings.py b/src/my_project/interviews/top_150_questions_round_22/ex_39_isomorphic_strings.py
new file mode 100644
index 00000000..2e2a555f
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_22/ex_39_isomorphic_strings.py
@@ -0,0 +1,7 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isIsomorphic(self, s: str, t: str) -> bool:
+
+        return len(set(s)) == len(set(t)) == len(set(zip(s,t)))
\ No newline at end of file
diff --git a/src/my_project/interviews/top_150_questions_round_22/ex_40_word_pattern.py b/src/my_project/interviews/top_150_questions_round_22/ex_40_word_pattern.py
new file mode 100644
index 00000000..f8a93c78
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_22/ex_40_word_pattern.py
@@ -0,0 +1,21 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def wordPattern(self, pattern: str, s: str) -> bool:        
+
+        dic_answer = dict()
+
+        words = s.split(' ')
+
+        if len(words) != len(pattern) or len(set(words)) != len(set(pattern)):
+            return False 
+        else:   
+            for k, v in enumerate(words):
+                if v in dic_answer:
+                    if dic_answer[v] != pattern[k]:
+                        return False 
+                else: 
+                    dic_answer[v] = pattern[k]
+
+            return True 
\ No newline at end of file
diff --git a/src/my_project/interviews/top_150_questions_round_22/ex_41_valid_anagram.py b/src/my_project/interviews/top_150_questions_round_22/ex_41_valid_anagram.py
new file mode 100644
index 00000000..4bb079dc
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_22/ex_41_valid_anagram.py
@@ -0,0 +1,13 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+
+        lst_s = [c for c in s]
+        lst_t = [c for c in t]
+
+        lst_s.sort()
+        lst_t.sort()
+
+        return lst_s == lst_t
\ No newline at end of file
diff --git a/tests/test_150_questions_round_22/test_38_ransom_note_round_22.py b/tests/test_150_questions_round_22/test_38_ransom_note_round_22.py
new file mode 100644
index 00000000..150764ef
--- /dev/null
+++ b/tests/test_150_questions_round_22/test_38_ransom_note_round_22.py
@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_38_ransom_note import Solution
+
+class RansomeNoteTestCase(unittest.TestCase):
+
+    def test_is_ransome_note(self):
+        solution = Solution()
+        output = solution.canConstruct(ransomNote="aa", magazine="aab")
+        self.assertTrue(output)
+
+    def test_is_no_ransome_note(self):
+        solution = Solution()
+        output = solution.canConstruct(ransomNote="a", magazine="b")
+        self.assertFalse(output)
\ No newline at end of file
diff --git a/tests/test_150_questions_round_22/test_39_isomorphic_strings_round_22.py b/tests/test_150_questions_round_22/test_39_isomorphic_strings_round_22.py
new file mode 100644
index 00000000..3acdd4a5
--- /dev/null
+++ b/tests/test_150_questions_round_22/test_39_isomorphic_strings_round_22.py
@@ -0,0 +1,15 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_39_isomorphic_strings import Solution
+
+class IsomorphicStringsTestCase(unittest.TestCase):
+
+    def test_are_isomorphic_strings(self):
+        solution = Solution()
+        output = solution.isIsomorphic(s="egg", t="add")
+        self.assertTrue(output)
+
+    def test_are_not_isomorphic_strings(self):
+        solution = Solution()
+        output = solution.isIsomorphic(s="foo", t="bar")
+        self.assertFalse(output)
\ No newline at end of file
diff --git a/tests/test_150_questions_round_22/test_40_word_pattern_round_22.py b/tests/test_150_questions_round_22/test_40_word_pattern_round_22.py
new file mode 100644
index 00000000..40ae8473
--- /dev/null
+++ b/tests/test_150_questions_round_22/test_40_word_pattern_round_22.py
@@ -0,0 +1,20 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_40_word_pattern import Solution
+
+class WordPatternTestCase(unittest.TestCase):
+
+    def test_is_word_pattern(self):
+        solution = Solution()
+        output = solution.wordPattern(pattern="abba", s="dog cat cat dog")
+        self.assertTrue(output)
+
+    def test_is_no_word_pattern_one(self):
+        solution = Solution()
+        output = solution.wordPattern(pattern="abc", s="dog cat cat fish")
+        self.assertFalse(output)
+
+    def test_is_no_word_pattern_two(self):
+        solution = Solution()
+        output = solution.wordPattern(pattern="aa", s="dog cat cat fish")
+        self.assertFalse(output)
\ No newline at end of file
diff --git a/tests/test_150_questions_round_22/test_41_valid_anagram_round_22.py b/tests/test_150_questions_round_22/test_41_valid_anagram_round_22.py
new file mode 100644
index 00000000..47bacad2
--- /dev/null
+++ b/tests/test_150_questions_round_22/test_41_valid_anagram_round_22.py
@@ -0,0 +1,16 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_41_valid_anagram import Solution
+
+class ValidAnagramTestCase(unittest.TestCase):
+
+    def test_is_valid_anagram(self):
+        solution = Solution()
+        output = solution.isAnagram(s="anagram", t="nagaram")
+        self.assertTrue(output)
+
+
+    def test_is_no_valid_anagram(self):
+        solution = Solution()
+        output = solution.isAnagram(s="rat", t="car")
+        self.assertFalse(output)
\ No newline at end of file