ϕ78⁡(λ,q⁢λ12,-q⁢λ12,a,b,c,-c,λ⁢q/c2λ12,-λ12,λ⁢q/a,λ⁢q/b,λ⁢q/c,-λ⁢q/c,c2;q,-λ⁢qa⁢b)=(λ⁢q,c2/λ;q)∞⁢(a⁢q,b⁢q,c2⁢q/a,c2⁢q/b;q2)∞(λ⁢q/a,λ⁢q/b;q)∞⁢(q,a⁢b⁢q,c2⁢q,c2⁢q/(a⁢b);q2)∞,