a^{v1}_{v0} b^{a2,v2}_{a0,a1} c^{a4}_{a3} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(a0) a+(v0) a-(v2) a-(v1)
+a^{v1}_{v0} b^{a2,v2}_{a0,a1} c^{a4}_{a3} lambda2^{a1,a3}_{a2,a4} a+(a0) a+(v0) a-(v2) a-(v1)
+1/2 a^{v1}_{v0} b^{a3,v2}_{a1,a2} c^{a4}_{a0} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a-(v2) a-(v1)