a^{c0,a2}_{a0,a1} b^{}_{} c^{a4,v1}_{a3,v0} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(a0) a+(v0) a-(v1) a-(c0)
+a^{c0,a2}_{a0,a1} b^{}_{} c^{a4,v1}_{a3,v0} lambda2^{a1,a3}_{a2,a4} a+(a0) a+(v0) a-(v1) a-(c0)
+1/2 a^{c0,a3}_{a1,a2} b^{}_{} c^{a4,v1}_{a0,v0} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a-(v1) a-(c0)