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extern void drawLineComponent(poly *  , int );
extern void drawOpaquePolygon(poly *  , GC  , GC  , int );
extern poly * copyPolygons(poly * );
extern void minMaxPolygons(poly * );
extern int polyCompare(poly *  , poly * );
extern void calcEyePoint(void );
extern void drawRenderedPolygon(poly *  , int );
extern void freePointResevoir(void);
extern void freeListOfPolygons(poly * );
extern void drawPolygons(int );
extern int lessThan(float  , float );
extern int greaterThan(float  , float );
extern int isNaN(float );
extern int isNaNPoint(float  , float  , float );
extern int equal(float  , float );