Equation Icon  2 [ (1-−-2-ξ)-× g′p′′′gq′′ (G ′ ′′′ G ′ ′′′ + G ′ G ′′ ′′ ′′′ 4 c a xy ;bp x y;q d xy;bd xy ;q p + Gyx′;q′′d′ Gy ′x;bp′′′ + Gyx;bd′ Gy′x′;q′′p′′′) ′′′ ′′ +gd ′p gq a(Gxy ′;bp′′′ Gx ′y;q′′c′ + Gxy;bc′ Gx′y′;q′′p′′′ + Gyx′;q′′c′ Gy′x;bp′′′ + Gyx;bc′ Gy ′x′;q′′p′′′) +g ′p′′′gq′′ (G ′ ′′′ G ′ ′′ ′ + G ′ G ′′ ′′′′′ c b xy ;ap xy;q d xy;ad xy;q p + Gyx′;q′′d′ Gy ′x;ap′′′ + Gyx;ad′ Gy ′x′;q′′p′′′) p′′′ q′′ +gd ′ g b(Gxy′;ap′′′ Gx ′y;q′′c′ + Gxy;ac′ Gx′y′;q′′p′′′ ] + Gyx′;q′′c′ Gy′x;ap′′′ + Gyx;ac′ Gy′x′;q′′p′′′) . (71 )