list all the different options that are filled in

[ichabod801]

You need to loop through itemtargetclasses, not just check the whole thing. But since itemtargetclasses is built with a loop anyway, you can just change how you build it:

itemtargetclasses = []
for item in Dataset:
    if item not in itemtargetclasses:
        itemtargetclasses.append(item)

That way, itemtargetclasses has no duplicates.