collapseos/blk/295

        ( DE contains prev offset )
        HL POPqq,           ( <-- lvl 2 )
        ( HL is prev field's addr. Is offset zero? )
        A D LDrr,
        E ORr,
        IFNZ,
            ( get absolute addr from offset )
            ( carry cleared from "or e" )
            DE SBCHLss,
            EXDEHL,             ( result in DE )
        THEN,
        HL POPqq,           ( <-- lvl 1 )
    JRNZ, AGAIN, ( inner-B292, try to match again )
    ( Z set? end of dict, unset Z )

                                                      ( cont. )