0(868,0):  16  [rn,rn,rn,rn,rn,rn,rn]  0  0  0  0  0  0  0   (*,*)  (*,*)  (*,*)  (*,*)  (*,*)  (*,*)  (*,*)  4  1,2,1,3,2,1,4,3,2,1,5,4,3,2,1,6,5,4,3,2,1,7,6,5,4,3,2,1