A.r(i,j)=tL(j)-[tL(i) +t(i,j)] B.r(i,j)=tL(j)-[tE(i) +t(i,j)] C.r(i,j)=tE(j)-[tL(i) +t(i,j)] D.r(i,j)=tE(j)-[tE(i) +t(i,j)]