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;;;
;;; Some functions for manipulating a SCFG parse tree
(require_module 'parser)
(define (scfg_simplify tree)
"(scfg_brackets_only tree)
Output only the bracketing and the bottom level pos and words."
(cond
((not tree) nil)
((car (cdr (assoc 'pos (car (cdr (car tree))))))
;; terminal node
(list
(car (cdr (assoc 'pos (car (cdr (car tree))))))
(car (car tree))))
(t
(cons
(car (car tree))
(mapcar scfg_simplify (cdr tree))))))
(define (scfg_simplify_relation_tree trees)
(mapcar scfg_simplify trees))
(defvar scfg_eos_tree eou_tree
"scfg_eos_tree
In MultiProbParse this CART tree is used to define end of sentence
within an utterance. It is applied to the token relation.
By default it is set to eou_tree.")
(provide 'scfg)
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