@@ -0,0 +1,31 @@
+"""Week 05: Emails homework."""
+
+import re
+
+
+class Emails(list):
+    """A list of unique, validated email addresses."""
+
+    _EMAIL_PATTERN = re.compile(r"^[A-Za-z0-9.!#$%&'*+/=?^_`{|}~-]+@[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?(?:\.[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)+$")
+
+    def __init__(self, emails):
+        validated = self.validate(emails)
+        super().__init__(validated)
+        self.data = self
+
+    @classmethod
+    def validate(cls, emails):
+        """Validate addresses and return unique values in input order."""
+        unique = []
+        for email in emails:
+            if not isinstance(email, str) or not cls._EMAIL_PATTERN.fullmatch(email):
+                raise ValueError(f"Invalid email address: {email!r}")
+            if email not in unique:
+                unique.append(email)
+        return unique
+
+    def __str__(self):
+        return str(list(self))
+
+    def __repr__(self):
+        return f"Emails({list(self)!r})"