Removing Duplicates at the Stac Level?

[J6767]

Running a pystac query as follows includes duplicate products:

def pystac_query(collection, max_items, time_range, lon, lat, max_cloud):
    client = Client.open("https://earth-search.aws.element84.com/v1") 

    query = client.search(
        max_items=max_items,
        collections=[collection],
        query={"eo:cloud_cover": {"lt": max_cloud}},
        datetime = time_range,
        intersects=dict(type="Point", coordinates=[lon, lat]),
    )
    items = query.item_collection()
    return query, items 

lat = 31.731557
lon = -102.042006
query, items = pystac_query("sentinel-2-l2a'", 100, "2020-01-01/2020-08-01", lon, lat, 30)

I do not want to download the duplicate items. What is the best way to remove them from the query, or from the item_collection? Thank you.