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