diff --git a/chapter-06/exercises.pl b/chapter-06/exercises.pl
index 89ed5e5..c415fe7 100644
--- a/chapter-06/exercises.pl
+++ b/chapter-06/exercises.pl
@@ -120,7 +120,7 @@
 %% constraints in Prolog. member and sublist might be useful predicates.
 
 %% I believe this is the correct answer:
-%% (green, Japanese, zebra) | (red, English, snail) | (blue, Spanish, jaguar)
+%% (red, englishman, snail) | (green, japanese, zebra) | (blue, spanish, jaguar)
 
 prefix(P,L) :- append(P,_,L).
 suffix(S,L) :- append(_,S,L).
@@ -128,8 +128,11 @@
 
 zebra_owner(ZebraOwner) :-
     Street = [_, _, _],
+    member(house(red, _, _), Street),
+    member(house(blue, _, _), Street),
+    member(house(green, _, _), Street),
     member(house(red, englishman, _), Street),
     member(house(_, spanish, jaguar), Street),
-    member(house(_, ZebraOwner, zebra), Street),
     sublist([house(_, _, snail), house(_, japanese, _)], Street),
-    sublist([house(_, _, snail), house(blue, _, _)], Street).
+    sublist([house(_, _, snail), house(blue, _, _)], Street),
+    member(house(_, ZebraOwner, zebra), Street).