def get_a_field_set_from_data(data, index=0):
    """
    Extract a unique (non-repeating) columnar set from supplied data

    It takes parameters:
    data (data in the form of a list of lists)
    and optionally:
    index (by default 0, it is the column field to extract)

    It returns a set of column field data scanned from all rows
    """
    return { row[index] for row in data }