a^{c1,a0}_{c0,c5} b^{c3,c5}_{c2,a1} c^{v0}_{c4} eta1^{a1}_{a0} a+(c0) a+(c2) a+(c4) a-(v0) a-(c3) a-(c1)
-1/2 a^{c0,a0}_{c3,c4} b^{c3,c4}_{c1,a1} c^{v0}_{c2} a+(c1) a+(c2) a+(a1) a-(v0) a-(a0) a-(c0)
-1/2 a^{c0,a0}_{c3,c4} b^{c3,c4}_{c1,a1} c^{v0}_{c2} eta1^{a1}_{a0} a+(c1) a+(c2) a-(v0) a-(c0)