diff --git a/fz/util.pl b/fz/util.pl
index 4fcbeda..2f8fffa 100644
--- a/fz/util.pl
+++ b/fz/util.pl
@@ -3,7 +3,7 @@
 % -- utility predicates -------------------------------------------------------
 
 % -- subset (SUB, SET, REST) --------------------------------------------------
-    
+
 subset(L, L, []).
 subset(S, [H|T], R) :- subset_aux(T, H, S, R).
 
--
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