(a⁢q,a⁢q/(d⁢e);q)n(a⁢q/d,a⁢q/e;q)n⁢ϕ34⁡(a⁢q/(b⁢c),d,e,q-na⁢q/b,a⁢q/c,d⁢e⁢q-n/a;q,q)=ϕ78⁡(a,q⁢a12,-q⁢a12,b,c,d,e,q-na12,-a12,a⁢q/b,a⁢q/c,a⁢q/d,a⁢q/e,a⁢qn+1;q,a2⁢q2+nb⁢c⁢d⁢e).