R _ TOTAL =( R _ M 1 C 11 / / R _ M 1 C 12 / /...// R _ M 1 C 1 j ) + R _ M 00 +( R _ M 0 C 11 / / R _ M 0 C 12 / /...// R _ M 0 C 1 i ) + R +( R _ M 0 C 21 / / R _ M 0 C 22 / /...// R _ M 0 C 2 m ) + R _ M 01 +( R _ M 1 C 21 / / R _ M 1 C 22 / /...// R _ M 1 C 2 n )