a^{a2,v0}_{a0,a1} b^{a4}_{a3} c^{v1}_{c0} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(c0) a+(a0) a-(v1) a-(v0)
+a^{a2,v0}_{a0,a1} b^{a4}_{a3} c^{v1}_{c0} lambda2^{a1,a3}_{a2,a4} a+(c0) a+(a0) a-(v1) a-(v0)
+1/2 a^{a3,v0}_{a1,a2} b^{a4}_{a0} c^{v1}_{c0} lambda2^{a1,a2}_{a3,a4} a+(c0) a+(a0) a-(v1) a-(v0)