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### begin_:  tvshow table
type   ;; title             ;; fname    ;; lname    
...
sitcom ;; flintstones       ;; barney   ;; rubble
gameshow ;; price is right  ;; bob      ;; barker
gameshow ;; jeopardy        ;; alex     ;; trebek

### begin_: query pseudo-code
TREE_SELECT type,title,fname,lname
...
WITH_LEVEL  (2,'title' )
WITH_LEVEL  (3,'lname','fname' )
WHERE       type = 'gameshow'

gameshow
    price is right
...
    jeopardy
        trebek,alex