from typing import List


def find_common_values(split_data: List[List[str]]) -> List[List[str]]:
    """
    Calculates the intersection of common votes for each user group
    """
    group_common_votes = []
    for user_group in split_data:
        group_sets = [set(user) for user in user_group]
        intersection = set.intersection(*group_sets)
        group_common_votes.append(intersection)

    return group_common_votes