Rye Inc. is a manufacturer of sporting equipment based in New Hampshire. It enters into an agreement with Sports R Us to supply $10,000$ catcher's mitts. Sports R Us is a local retail chain of sporting goods stores based in Massachusetts. Although Sports R Us does not operate any out$-$of$-$state retail stores, the company does own a warehouse in Exeter, New Hampshire, which it uses for short$-$term storage of overflow merchandise. Rye sues Sports R Us in the federal court in New Hampshire for breaking the contract. The federal court in New Hampshire has personal jurisdiction over Sports R Us primarily because of: