'? CASE NOT [IF] 51 52 LOADR+ [THEN] DROP ( B152-153 )
'? FILL NOT [IF] 53 LOAD+ [THEN] DROP ( B154 )
1 7 LOADR+
: BROWSE
    0 ACC ! L
    BEGIN
        KEY CASE
            'Q' OF EXIT ENDOF
            'B' OF B ENDOF
            'N' OF N ENDOF
            _NUM
        ENDCASE
    AGAIN
;
( I masks DO..LOOP's I. Do it as late as possible. )
: I _I ;