While researching a topic, a student has taken the following notes:
• Nissologists are scientists who study islands.
• Some nissologists define an island as any piece of land surrounded by water.
• Using that definition, they determined that Sweden has 221,000 islands.
• Other nissologists define an island as being 1 kilometer square, a certain distance from the mainland, and having at least 50 permanent residents.
• Using that definition, they determined that Sweden has 24 islands.