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+;;; -*- Mode: Lisp; Syntax: Common-Lisp; -*-
+
+(define-language
+  :grammar
+  '(((S $any) -> (S1 $any))
+    ((S (Compound $s1 $s2)) -> (S1 $s1) (Conjunction) (S1 $s2))
+    
+    ((S1 (Statement $v)) -> (NP $subj) (VP $subj $tense $v))
+    ((S1 (Acknowledge $a)) -> (Acknowledge $a))
+    ((S1 (Command $v)) -> (VP Self present $v))
+    ((S1 (Question $v)) -> (Aux $tense) (NP $subj) (VP $subj $tense $v))
+    ((S1 (Question $v)) -> (Be $tense) (NP $subj) (Be-Arg $subj $tense $v))
+
+    ((Be-Arg $subj $tense (Occur $tense (loc $subj $loc))) ->
+     (Loc-Adjunct $tense (loc $subj $loc)))
+
+    ((VP $subj $tense (Occur $tense $v)) -> (VP1 $subj $tense $v))
+    ((VP $subj $tense (Occur $tense $v)) -> (Aux $tense)(VP1 $subj present $v))
+
+    ((VP1 $subj $tense $v) -> (VP2 $subj $tense $v) (Adjunct? $v))
+
+    ((VP2 $subj $tense ($rel $subj $loc)) ->
+     (Verb/in $rel $tense))
+    ((VP2 $subj $tense ($rel $subj $loc $obj)) ->
+     (Verb/tr $rel $tense) (NP $obj))
+    ((VP2 $subj $tense ($rel $subj $loc $obj $obj2)) -> 
+     (Verb/di $rel $tense) (NP $obj) (NP $obj2))
+    ((VP2 $subj $tense (loc $subj $loc)) ->
+     (Be $tense) (Loc-Adjunct $tense (loc $subj $loc)))
+
+    ((NP $n) -> (Pronoun $n))
+    ((NP $n) -> (Article) (Noun $n))
+    ((NP $n) -> (Noun $n))
+    ((NP ($x $y)) -> (Number $x) (Number $y))
+
+    ((PP ($prep $n)) -> (Prep $prep) (NP $n))
+    ((Adjunct? $v) ->)
+    ((Adjunct? $v) -> (Loc-Adjunct $tense $v))
+    #+Allegro ((Loc-Adjunct $tense ($rel $subj $loc @rest)) -> (PP $loc))
+    #+Allegro ((Loc-Adjunct $tense ($rel $subj $loc @rest)) -> (Adjunct $loc))
+    #+Lucid ((Loc-Adjunct $tense ($rel $subj $loc . $rest)) -> (PP $loc))
+    #+Lucid ((Loc-Adjunct $tense ($rel $subj $loc . $rest)) -> (Adjunct $loc))
+
+    )
+  :lexicon
+  '(
+    ((Acknowledge $a) -> (yes true) (no false) (maybe unknown) (huh unparsed))
+    ((Adjunct $loc) -> here there (nearby near) near left right up down)
+    ((Article) -> a an the)
+    ((Aux $tense) -> (will future) (did past) (do $finite))
+    ((Be $tense) -> (am present) (are present) (is present) (be $finite)
+     (was past) (were past))
+    ((Conjunction) -> and --)
+    ((Noun $n) -> gold Wumpus pit breeze stench glitter nothing)
+    ((Number $n) -> 0 1 2 3 4 5 6 7 8 9)
+    ((Prep $prep) -> in at to near)
+    ((Pronoun $n) -> (you self) (me master) (I master))
+    
+    ((Verb/in $rel $tense) -> (go move $finite) (went move past)
+     (move move $finite) (move move past) (shoot shoot $finite))
+    ((Verb/tr $rel $tense) -> (move carry $finite) (moved carry past)
+     (carry carry $finite) (carry carried past)
+     (grab grab $finite) (grab grabbed past) (get grab $finite)
+     (got grab past) (release release $finite) (release release past)
+     (drop release $finite) (dropped release past) (shoot shoot-at $finite)
+     (shot shoot-at past) (kill shoot-at $finite) (killed shoot-at past)
+     (smell perceive $finite) (feel perceive $finite) (felt perceive past))
+    ((Verb/di $rel $tense) -> (bring bring $finite) (brought bring past)
+     (get bring $finite) (got bring past))
+    ))
+
+(defparameter *sentences*
+  '((I will shoot the wumpus at 4 4)
+    (yes)
+    (You went right -- I will go left)
+    (carry the gold)
+    (yes and no)
+    (did you bring me the gold)
+    (a breeze is here -- I am near 5 3)
+    (a stench is in 3 5)
+    (a pit is nearby)
+    (is the wumpus near)
+    (Did you go to 3 8)
+    (Yes -- Nothing is there)
+    (Shoot -- Shoot left)
+    (Kill the wumpus -- shoot up)))
+
+(defun ss (&optional (sentences *sentences*))
+  "Run some test sentences, and count how many were not parsed."
+  (count-if-not
+   #'(lambda (s)
+       (format t "~2&>>> ~(~{~a ~}~)~%" s)
+       (write (second (parse s)) :pretty t))
+   *sentences*))