Collection<Booking> getBookings(Organization anOrganization)

Given: The Organization object, organization9

1. Access the collection of Permit objects linked to organization9, which in this case is {permit5, permit66}.
2. Create a new empty collection, results.
   For each Permit object accessed in step 1:
3. Access it's collection of Booking objects
4. Add each Booking object to results
5. Return results

If there are no Permits linked to an Organization, or no Bookings linked to a Permit then return an empty collection

private collection<Booking> bookings

public collection<Booking> getBookings()
Post condition: returns bookings

private collection<Permit> permits

public collection<Booking> getBookings()
Post condition: returns a collection of all Booking objects linked to all Permit objects in permits.

Collection<Booking> getBookings(Organization anOrganization)
Post condition: returns a collection of Booking objects which are linked to the Permit objects linked to anOrganization

consistsOf from Permit to Booking
hasPermit from Organization to Permit