diff --git a/tools/utils/set.go b/tools/utils/set.go
index 477fa9646..cff09034c 100644
--- a/tools/utils/set.go
+++ b/tools/utils/set.go
@@ -84,7 +84,7 @@ func (self *Set[T]) Subtract(other *Set[T]) (ans *Set[T]) {
 	return ans
 }
 
-func (self *Set[T]) IsSubset(other *Set[T]) bool {
+func (self *Set[T]) IsSubsetOf(other *Set[T]) bool {
 	for x := range self.items {
 		if !other.Has(x) {
 			return false
@@ -101,3 +101,9 @@ func NewSet[T comparable](capacity ...int) (ans *Set[T]) {
 	}
 	return
 }
+
+func NewSetWithItems[T comparable](items ...T) (ans *Set[T]) {
+	ans = NewSet[T](len(items))
+	ans.AddItems(items...)
+	return ans
+}