-1/2 a^{c0,a0}_{v0,v1} b^{v2}_{a1} c^{a3}_{a2} eta1^{a2}_{a0} gamma1^{a1}_{a3} a+(v0) a+(v1) a-(v2) a-(c0)
-1/2 a^{c0,a0}_{v0,v1} b^{v2}_{a1} c^{a3}_{a2} lambda2^{a1,a2}_{a0,a3} a+(v0) a+(v1) a-(v2) a-(c0)