<prompt> Translate the following text to SwahiliA trade treaty gave the Dutch command of the spice trade but reserved Johors rights in tin exports from Perak, Selangor, and Klang.  <response>: Mkataba wa kibiashara ulimpa Uholanzi mamlaka ya biashara ya vikolezo lakini ulihifadhi haki za Johor katika mauzo ya bati kutoka Perak, Selangor, na Klang. 