extern struct LevelInfo_EM native_em_level;
extern struct GraphicInfo_EM graphic_info_em_object[TILE_MAX][8];
extern struct GraphicInfo_EM graphic_info_em_player[MAX_PLAYERS][PLY_MAX][8];
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-extern short **Boom;
-extern short **Cave;
-extern short **Next;
-extern short **Draw;
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extern struct GameInfo_EM game_em;
extern unsigned char tab_blank[TILE_MAX];