You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: After the Swedish loss at the battle of Fehrbellin in June 1675, the fleet was to support troop transports to reinforce Swedish Pomerania. It had potential for success as it was equipped with several large, well-armed ships: Svärdet ("the sword") of 1,800 tonnes, Äpplet ("the orb") and Nyckeln ("the key"), both 1,400 tonnes, and the enormous Kronan ("the crown"). Altogether there were 28 large and medium warships and almost the same number of smaller vessels. The supply organization was lacking. There were few experienced high-ranking officers and internal cooperation was poor; Danish contemporaries scornfully described the Swedish Navy crews as mere "farmhands dipped in saltwater".With Kronan as its flagship, the fleet went to sea in October 1675 under Admiral of the Realm (riksamiral) Gustaf Otto Stenbock, but got no farther than Stora Karlsö off Gotland. The weather was unusually cold and stormy and the ships could not be heated. The crew were poorly clothed and soon many of them fell ill. Supplies dwindled, and after Kronan lost a bow anchor after less than two weeks at sea, Stenbock decided to turn back to the Dalarö anchorage north of Stockholm. Nothing came of the reinforcements of the North German provinces. King Charles reacted with anger and held Stenbock personally responsible for the failed expedition, forcing him to pay more than 100,000 dalers out of his own pocket. King Charles later rehabilitated Stenbock by giving him an army appointment in Norway, but in early 1676 he replaced him with Lorentz Creutz, a prominent treasury official. Naval historian Jan Glete has explained this as a step that was "necessary in a time of crisis" due to Creutz's administrative skills and treasury connections, but Creutz had no experience as a naval commander, something that would later prove crucial.
Output:
What are the specific names of the four well-armed ships with which the Swedish fleet was equipped?