1/4 a^{a1}_{a0} b^{c0,c1}_{v0,v1} c^{a3}_{a2} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(v0) a+(v1) a-(c1) a-(c0)
+1/4 a^{a1}_{a0} b^{c0,c1}_{v0,v1} c^{a3}_{a2} lambda2^{a0,a2}_{a1,a3} a+(v0) a+(v1) a-(c1) a-(c0)