diff --git a/predicators/approaches/grammar_search_invention_approach.py b/predicators/approaches/grammar_search_invention_approach.py
index 7a2393410e..3b4e0c586a 100644
--- a/predicators/approaches/grammar_search_invention_approach.py
+++ b/predicators/approaches/grammar_search_invention_approach.py
@@ -1135,7 +1135,7 @@ def _select_predicates_by_clustering(
             # within the PlaceOnTable cluster in painting, but we don't want to
             # remove them, since we had generated them specifically to
             # disambiguate segments in the cluster with the Pick option.
-            # A consistent predicate is is either an add effect, a delete
+            # A consistent predicate is either an add effect, a delete
             # effect, or doesn't change, within each cluster, for all clusters.
             # Note that it is possible that when 2 inconsistent predicates are
             # removed, then two clusters cannot be disambiguated, but if you