Look_Back_Letter  118 ext/standard/metaphone.c #define Prev_Letter (Look_Back_Letter(1))
Look_Back_Letter  344 ext/standard/metaphone.c 				if (!(NOGHTOF(Look_Back_Letter(3)) ||
Look_Back_Letter  345 ext/standard/metaphone.c 					  Look_Back_Letter(4) == 'H')) {