rem: Node *node4(a,b,c,d,e) Node *b, *c, *d, *e;
add: node4(int a, Node *b, Node *c, Node *d, Node *e)
context: Node *node4(a,b,c,d,e) Node *b, *c, *d, *e;{	register Node *x;	x = nodealloc(4);	x->nobj = a;	x->narg[0] = b;	x->narg[1] = c;	x->narg[2] = d;	x->narg[3] = e;	return(x);}