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