diff --git a/solutions/python/pangram/3/pangram.py b/solutions/python/pangram/3/pangram.py
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+"""
+Pangram.
+
+You work for a company that sells fonts through their website. They'd like to show a
+different sentence each time someone views a font on their website. To give a
+comprehensive sense of the font, the random sentences should use all the letters
+in the English alphabet.
+
+They're running a competition to get suggestions for sentences that they can use.
+You're in charge of checking the submissions to see if they are valid.
+"""
+
+import string
+
+letters: str = string.ascii_lowercase
+
+
+def is_pangram(sentence: str) -> bool:
+    """
+    Verify that the random sentences uses all the letters in the English alphabet.
+
+    :param sentence: The sentence to check for pangram validity
+    :type sentence: str
+    :return: True if the sentence contains all 26 letters of the English alphabet, False otherwise
+    :rtype: bool
+    """
+    # Empty string
+    if not sentence:
+        return False
+
+    # Convert sentence to lowercase and extract unique alphabetic characters
+    unique_letters: set = set(
+        char for char in sentence.lower() if char.isalpha()
+    )
+    return len(unique_letters) == 26