-1/2 a^{a1}_{a0} b^{c0,c1}_{a2,v0} c^{a3,v2}_{c2,v1} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(c2) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)
-1/2 a^{a1}_{a0} b^{c0,c1}_{a2,v0} c^{a3,v2}_{c2,v1} lambda2^{a0,a2}_{a1,a3} a+(c2) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)