2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93274I describe a method for pasting together certain quantum error-correcting codes that correct one error to make a single larger one-error quantum code. I show how to construct codes encoding 7 qubits in 13 qubits using the method, as well as 15 qubits in 21 qubits and all the other "perfect" codes.7 pages, REVTeX, submitted to Phys. Rev. AQuantum Physicstext