a magnet attracts magnetic metals / ferromagnetic metals through magnetism & a paper clip is often made of magnetic metals ->  a magnet can attract a paper clip  a magnet can attract a paper clip & an unknown object can attract a paper clip ->  an unknown object and a magnet can both attract a paper clip  an unknown object and a magnet can both attract a paper clip & the ability to attract a paper clip is a kind of property ->  the unknown object has the same property as a magnet  the unknown object has the same property as a magnet & a magnet is magnetic -> the unknown object is magnetic