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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-308/
+"""
+
+Task 1: Count Common
+
+Submitted by: [46]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given two array of strings, @str1 and @str2.
+
+   Write a script to return the count of common strings in both arrays.
+
+Example 1
+
+Input: @str1 = ("perl", "weekly", "challenge")
+       @str2 = ("raku", "weekly", "challenge")
+Output: 2
+
+Example 2
+
+Input: @str1 = ("perl", "raku", "python")
+       @str2 = ("python", "java")
+Output: 1
+
+Example 3
+
+Input: @str1 = ("guest", "contribution")
+       @str2 = ("fun", "weekly", "challenge")
+Output: 0
+
+Task 2: Decode XOR
+"""
+### solution by pokgopun@gmail.com
+
+def countCommon(strs1: tuple[str], strs2: tuple[str]) -> int:
+    return len( set(strs1) & set(strs2) )
+
+import unittest
+
+class TestCountCommon(unittest.TestCase):
+    def test(self):
+        for (strs1, strs2), otpt in {
+                (("perl", "weekly", "challenge"),("raku", "weekly", "challenge")): 2,
+                (("perl", "raku", "python"),("python", "java")): 1,
+                (("guest", "contribution"),("fun", "weekly", "challenge")): 0,
+                }.items():
+            self.assertEqual(countCommon(strs1,strs2), otpt)
+
+unittest.main()