def initialise_data_counters(read_length):
    """Clean initialisation of empty dictionaries used for counters."""
    all_read_data = list(({}, {}, {}))
    for read_data in all_read_data:
        for i in range(0, read_length):
            read_data[i] = 0
    return all_read_data[0], all_read_data[1], all_read_data[2]
