1/4 a^{c0,a0}_{v0,v1} b^{v2}_{c1} c^{c1,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(v0) a+(v1) a-(v2) a-(c0)
-1/4 a^{c0,a0}_{v0,v1} b^{v2}_{c1} c^{c2,a3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c1) a+(v0) a+(v1) a-(v2) a-(c2) a-(c0)
-1/2 a^{c0,a2}_{v0,v1} b^{v2}_{c1} c^{c1,a1}_{a0,a3} eta1^{a3}_{a2} a+(a0) a+(v0) a+(v1) a-(v2) a-(a1) a-(c0)