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+Grammaire
+$accept: programme "end"
+programme: paragraphes "end"
+paragraphes: %empty
+            | paragraphes paragraphe
+paragraphe: definition "\n\n"
+           | error "\n\n"
+definition: definition_zone
+           | definition_scene
+definition_zone: "symbol" "est" "une" "zone" ":" "[" liste_points "]" "." scenes
+liste_points: point
+             | liste_points ";" point
+point: "(" float "," float ")"
+float: INT
+      | FLOAT
+scenes: scene
+       | scenes scene
+scene: "symbol" "."
+definition_scene: "symbol" "est" "une" "scene" ":" SCENE_TOK "."