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ref: aee77b97a7506d7cd3f02f80a713f1e6b5d1271e
dir: /examples/accept.peg/

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start	<- abcd+

abcd	<- 'a' { printf("A %d\n", yypos); } bc { printf("ABC %d\n", yypos); } &{YYACCEPT}
	 / 'b' { printf("B %d\n", yypos); } cd { printf("BCD %d\n", yypos); } &{YYACCEPT}

bc	<- 'b' { printf("B %d\n", yypos); } 'c' { printf("C %d\n", yypos); }

cd	<- 'c' { printf("C %d\n", yypos); } 'd' { printf("D %d\n", yypos); }