745 in_list(TREE *tp, TREE **npp)  in in_list()  argument
749 	while ((sp = *npp++) != NULL)  in in_list()
765 	TREE **npp = node;  in LEFT1()  local
769 		unprotect(*npp++ = RIGHT(x));  in LEFT1()
773 		unprotect(*npp++ = PARENT(x));  in LEFT1()
782 	*npp = NULL;  in LEFT1()
783 	npp = node;  in LEFT1()
784 	while ((tp = *npp++) != NULL)  in LEFT1()
785 		if (tp != x && tp != y && !in_list(tp, npp))  in LEFT1()
793 	TREE **npp = node;  in RIGHT1()  local
797 		unprotect(*npp++ = LEFT(x));  in RIGHT1()
801 		unprotect(*npp++ = PARENT(x));  in RIGHT1()
810 	*npp = NULL;  in RIGHT1()
811 	npp = node;  in RIGHT1()
812 	while ((tp = *npp++) != NULL)  in RIGHT1()
813 		if (tp != x && tp != y && !in_list(tp, npp))  in RIGHT1()
821 	TREE **npp = node;  in BULEFT2()  local
825 		unprotect(*npp++ = RIGHT(x));  in BULEFT2()
829 		unprotect(*npp++ = RIGHT(y));  in BULEFT2()
833 		unprotect(*npp++ = PARENT(x));  in BULEFT2()
844 	*npp = NULL;  in BULEFT2()
845 	npp = node;  in BULEFT2()
846 	while ((tp = *npp++) != NULL)  in BULEFT2()
847 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in BULEFT2()
855 	TREE **npp = node;  in BURIGHT2()  local
859 		unprotect(*npp++ = LEFT(x));  in BURIGHT2()
863 		unprotect(*npp++ = LEFT(y));  in BURIGHT2()
867 		unprotect(*npp++ = PARENT(x));  in BURIGHT2()
878 	*npp = NULL;  in BURIGHT2()
879 	npp = node;  in BURIGHT2()
880 	while ((tp = *npp++) != NULL)  in BURIGHT2()
881 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in BURIGHT2()
889 	TREE **npp = node;  in TDLEFT2()  local
893 		unprotect(*npp++ = RIGHT(y));  in TDLEFT2()
897 		unprotect(*npp++ = PARENT(x));  in TDLEFT2()
906 	*npp = NULL;  in TDLEFT2()
907 	npp = node;  in TDLEFT2()
908 	while ((tp = *npp++) != NULL)  in TDLEFT2()
909 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in TDLEFT2()
918 	TREE **npp = node;
922 		unprotect(*npp++ = LEFT(y));
926 		unprotect(*npp++ = PARENT(x));
935 	*npp = NULL;
936 	npp = node;
937 	while ((tp = *npp++) != NULL)
938 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))