747 in_list(TREE *tp, TREE **npp)  in in_list()  argument
751 	while ((sp = *npp++) != NULL)  in in_list()
767 	TREE **npp = node;  in LEFT1()  local
771 		unprotect(*npp++ = RIGHT(x));  in LEFT1()
775 		unprotect(*npp++ = PARENT(x));  in LEFT1()
784 	*npp = NULL;  in LEFT1()
785 	npp = node;  in LEFT1()
786 	while ((tp = *npp++) != NULL)  in LEFT1()
787 		if (tp != x && tp != y && !in_list(tp, npp))  in LEFT1()
795 	TREE **npp = node;  in RIGHT1()  local
799 		unprotect(*npp++ = LEFT(x));  in RIGHT1()
803 		unprotect(*npp++ = PARENT(x));  in RIGHT1()
812 	*npp = NULL;  in RIGHT1()
813 	npp = node;  in RIGHT1()
814 	while ((tp = *npp++) != NULL)  in RIGHT1()
815 		if (tp != x && tp != y && !in_list(tp, npp))  in RIGHT1()
823 	TREE **npp = node;  in BULEFT2()  local
827 		unprotect(*npp++ = RIGHT(x));  in BULEFT2()
831 		unprotect(*npp++ = RIGHT(y));  in BULEFT2()
835 		unprotect(*npp++ = PARENT(x));  in BULEFT2()
846 	*npp = NULL;  in BULEFT2()
847 	npp = node;  in BULEFT2()
848 	while ((tp = *npp++) != NULL)  in BULEFT2()
849 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in BULEFT2()
857 	TREE **npp = node;  in BURIGHT2()  local
861 		unprotect(*npp++ = LEFT(x));  in BURIGHT2()
865 		unprotect(*npp++ = LEFT(y));  in BURIGHT2()
869 		unprotect(*npp++ = PARENT(x));  in BURIGHT2()
880 	*npp = NULL;  in BURIGHT2()
881 	npp = node;  in BURIGHT2()
882 	while ((tp = *npp++) != NULL)  in BURIGHT2()
883 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in BURIGHT2()
891 	TREE **npp = node;  in TDLEFT2()  local
895 		unprotect(*npp++ = RIGHT(y));  in TDLEFT2()
899 		unprotect(*npp++ = PARENT(x));  in TDLEFT2()
908 	*npp = NULL;  in TDLEFT2()
909 	npp = node;  in TDLEFT2()
910 	while ((tp = *npp++) != NULL)  in TDLEFT2()
911 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))  in TDLEFT2()
920 	TREE **npp = node;
924 		unprotect(*npp++ = LEFT(y));
928 		unprotect(*npp++ = PARENT(x));
937 	*npp = NULL;
938 	npp = node;
939 	while ((tp = *npp++) != NULL)
940 		if (tp != x && tp != y && tp != z && !in_list(tp, npp))