! INDEX_FILE DATA_FILE LINK_TEXT INDEX_TEXT
!
    A            1       File1    A1  first
    A            2       File2    A2  second
    A            3       File3    A3  third
    B            1       File1    B1  fourth
    A            4       File4    A4  fifth
    C            5       File5    C5  sixth
    C            4       File4    C4  seventh
    B            2       File2    B2  eighth
    B            1       File1    B1  nineth
    C            3       File3    C3  tenth
    A            5       File5    A5  eleventh