diff --git a/Chapter2/generic_search.py b/Chapter2/generic_search.py
index 6e0ceb7..d5d0032 100644
--- a/Chapter2/generic_search.py
+++ b/Chapter2/generic_search.py
@@ -32,11 +32,11 @@ def linear_contains(iterable: Iterable[T], key: T) -> bool:
 
 
 class Comparable(Protocol):
-    def __eq__(self, other: Any) -> bool:
-        ...
+    def __eq__(self: C, other: C) -> bool:
+        return self == other
 
     def __lt__(self: C, other: C) -> bool:
-        ...
+        return (self < other) and self != other
 
     def __gt__(self: C, other: C) -> bool:
         return (not self < other) and self != other