def gen_item_support(transaction_list, item_set):
    """
    Generate support for each item in transaction list.

    Args:
        transaction_list (list[set]): Transaction list.
        item_set (set): Item set.

    Returns:
        (dict) Dictionary for each item with support.
    """
    item_set_support = dict.fromkeys(item_set, 0)
    for transaction in transaction_list:
        for item in item_set:
            if item.issubset(transaction):
                item_set_support[item] += 1

    return item_set_support