A country has a capital city
A dining philosopher uses a fork
A file is an ordinary file or a directory file
Files contains records
A polygon is composed of an ordered set of points
A drawing object is text, a geometrical object, or a group
A person uses a computer language on a object
Modems and keyboards are input/output devices
Classes may have several attributes
A person plays for a team in a certain year
A route connects two cities
A student takes a course from a professor
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