Drive car has a sub-event of keep tally. Go to party has a sub-event of use computer. Buy something has a sub-event of order food. Order food does not have a sub-event of use telescope. Order food has a sub-event of buy something. Go on vacation does not have a sub-event of get clean. Go on vacation has a sub-event of order food. Go to party has a sub-event of keep tally. Go on vacation does not have a sub-event of use telescope. Order food is a activity. Order food has a sub-event of use computer.
Go on vacation has a sub-event of buy something.