equation icon  (5) E F G H REF GH gA gB gC n = 2 \~/ [AKB]C , (50) (5)REF GH gAEnF gBGnH = - £ nKAB + KAC KC B, (51) (5) C D C RCD gA gB = RAB - £ nKAB - KKAB + 2KAC K B. (52)