diff -r b95b12cb31e2 -r f066fc0bdc7a contrib/perf-utils/subsetmaker.py
--- a/contrib/perf-utils/subsetmaker.py	Mon Jan 06 01:27:42 2025 -0500
+++ b/contrib/perf-utils/subsetmaker.py	Mon Jan 06 01:33:08 2025 -0500
@@ -183,8 +183,8 @@
         selected.add(pick)
         undecided.remove(pick)
 
-        ancestors = set(p for p in parents(pick) if p in undecided)
-        descendants = set(c for c in children(pick) if c in undecided)
+        ancestors = {p for p in parents(pick) if p in undecided}
+        descendants = {c for c in children(pick) if c in undecided}
 
         while ancestors:
             current = ancestors.pop()