Can't find List.Contains node and don't know why

I can’t find List.Contains node and don’t know why. I thought it was part of spring nodes but is not there. Any idea what package am I missing?

I tried the OOTB node but it does not do the same. I’m trying to see if items of list 1 exist in list 2.

try copy pasta this in a python node.

import clr
from Autodesk.DesignScript.Geometry import *
#The inputs to this node will be stored as a list in the IN variables.

OGList= IN[0]
ListCompare = IN[1]
Output = []
missedtemp = []
missed = []

for Item in OGList:
	for ItemCompare in ListCompare:

		if Item == ItemCompare:
		elif Item != ItemCompare:

	if len(missedtemp) == len(ListCompare):

#Assign your output to the OUT variable.
OUT = Output

Also i think the package you’re looking for is called Ampersand