-1/4 a^{c0,c1}_{v0,v1} b^{a1,a2}_{c2,a0} c^{c2}_{a3} eta1^{a3}_{a2} a+(a0) a+(v0) a+(v1) a-(a1) a-(c1) a-(c0)
+1/8 a^{c0,c1}_{v0,v1} b^{a1,a2}_{c2,a0} c^{c2}_{a3} lambda2^{a0,a3}_{a1,a2} a+(v0) a+(v1) a-(c1) a-(c0)
+1/8 a^{c0,c1}_{v0,v1} b^{a1,a2}_{c2,a0} c^{c3}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c2) a+(v0) a+(v1) a-(c3) a-(c1) a-(c0)