-1/4 a^{a0}_{a1} b^{a3,a4}_{a2,v0} c^{c1,c2}_{c0,v1} lambda2^{a1,a2}_{a3,a4} a+(c0) a+(v0) a+(v1) a-(a0) a-(c2) a-(c1)
+1/2 a^{a2}_{a1} b^{a0,a4}_{a3,v0} c^{c1,c2}_{c0,v1} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(c0) a+(v0) a+(v1) a-(a0) a-(c2) a-(c1)
+1/2 a^{a2}_{a1} b^{a0,a4}_{a3,v0} c^{c1,c2}_{c0,v1} lambda2^{a1,a3}_{a2,a4} a+(c0) a+(v0) a+(v1) a-(a0) a-(c2) a-(c1)