1/2 a^{v1}_{v0} b^{a0}_{v2} c^{a3,v3}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(v0) a+(v2) a-(v3) a-(v1)
+1/2 a^{v2}_{v0} b^{a0}_{v2} c^{a3,v1}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(v0) a-(v1)
+a^{v2}_{v0} b^{a2}_{v2} c^{a1,v1}_{a0,a3} eta1^{a3}_{a2} a+(a0) a+(v0) a-(v1) a-(a1)