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