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