-1/2 a^{a1}_{a0} b^{a2}_{c0} c^{v0,v1}_{a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c0) a+(a0) a-(v1) a-(v0)
-1/4 a^{a1}_{a0} b^{a2}_{c0} c^{v0,v1}_{a3,a4} lambda2^{a3,a4}_{a1,a2} a+(c0) a+(a0) a-(v1) a-(v0)
+1/2 a^{a2}_{a1} b^{a3}_{c0} c^{v0,v1}_{a0,a4} eta1^{a4}_{a2} gamma1^{a1}_{a3} a+(c0) a+(a0) a-(v1) a-(v0)
+1/2 a^{a2}_{a1} b^{a3}_{c0} c^{v0,v1}_{a0,a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a+(a0) a-(v1) a-(v0)