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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-266/
+"""
+
+Task 1: Uncommon Words
+
+Submitted by: [41]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given two sentences, $line1 and $line2.
+
+   Write a script to find all uncommmon words in any order in the given
+   two sentences. Return ('') if none found.
+
+     A word is uncommon if it appears exactly once in one of the
+     sentences and doesn’t appear in other sentence.
+
+Example 1
+
+Input: $line1 = 'Mango is sweet'
+       $line2 = 'Mango is sour'
+Output: ('sweet', 'sour')
+
+Example 2
+
+Input: $line1 = 'Mango Mango'
+       $line2 = 'Orange'
+Output: ('Orange')
+
+Example 3
+
+Input: $line1 = 'Mango is Mango'
+       $line2 = 'Orange is Orange'
+Output: ('')
+
+Task 2: X Matrix
+"""
+### solution by pokgopun@gmail.com
+
+def uncommonWords(line1, line2):
+    words = f'{line1} {line2}'.split()
+    return tuple(
+            w for w in words if words.count(w)==1
+            ) or ('',)
+
+
+import unittest
+
+class TestUncommonWords(unittest.TestCase):
+    def test(self):
+        for (line1,line2), ans in {
+                ('Mango is sweet','Mango is sour'): ('sweet', 'sour'),
+                ('Mango Mango','Orange'): ('Orange',),
+                ('Mango is Mango','Orange is Orange'): ('',),
+                }.items():
+            self.assertEqual(uncommonWords(line1,line2),ans)
+
+unittest.main()