1/4 a^{c0}_{v0} b^{a0,a1}_{c1,c2} c^{a4,v1}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(c1) a+(c2) a+(v0) a-(v1) a-(a0) a-(c0)
+1/4 a^{c0}_{v0} b^{a1,a2}_{c1,c2} c^{a0,v1}_{a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c1) a+(c2) a+(v0) a-(v1) a-(a0) a-(c0)
+1/8 a^{c0}_{v0} b^{a1,a2}_{c1,c2} c^{a0,v1}_{a3,a4} lambda2^{a3,a4}_{a1,a2} a+(c1) a+(c2) a+(v0) a-(v1) a-(a0) a-(c0)