Modifying a Python Script to process list of objects

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Update: I found the solution. For those interested, here’s the modified code:

import clr
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
from Revit.Elements import *
clr.AddReference('System')
from System.Collections.Generic import *
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
app = uiapp.Application

#The inputs to this node will be stored as a list in the IN variables.
dataEnteringNode = IN
symbol = UnwrapElement(IN[0])
refPlane = UnwrapElement(IN[1])
locations = []
for i in IN[2]:
    locations.append(UnwrapElement(i).ToXyz())
referenceDirections = []
for i in IN[3]:
    referenceDirections.append(UnwrapElement(i).ToXyz())
out = []

symbol.Activate()
reference = Reference(refPlane)

TransactionManager.Instance.EnsureInTransaction(doc)

for location, direction in zip(locations, referenceDirections):
    new = doc.Create.NewFamilyInstance(reference,location,direction,symbol)
out.append(new)

TransactionManager.Instance.TransactionTaskDone()

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