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#ifdef _NO_PROTO
extern float phong();
extern int hueValue();
extern int getHue();
extern float Value();
extern RGB hlsTOrgb();
#else
extern float phong(triple  , float [3]);
extern int hueValue(float );
extern int getHue(float );
extern float Value(float  , float  , float );
extern RGB hlsTOrgb(float  , float  , float );
#endif