1/2 a^{a2,a3}_{a0,a1} b^{v0}_{a4} c^{v1}_{a5} eta1^{a5}_{a3} eta1^{a4}_{a2} a+(a0) a+(a1) a-(v1) a-(v0)
+1/4 a^{a2,a3}_{a0,a1} b^{v0}_{a4} c^{v1}_{a5} lambda2^{a4,a5}_{a2,a3} a+(a0) a+(a1) a-(v1) a-(v0)
-1/2 a^{a3,a4}_{a0,a2} b^{v0}_{a1} c^{v1}_{a5} lambda2^{a2,a5}_{a3,a4} a+(a0) a+(a1) a-(v1) a-(v0)
+1/2 a^{a3,a4}_{a0,a2} b^{v0}_{a5} c^{v1}_{a1} lambda2^{a2,a5}_{a3,a4} a+(a0) a+(a1) a-(v1) a-(v0)