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302: Mainline

Now, the one-parameter constructors in the Movie and Symphony classes call the one-parameter constructor in the Attraction class:

*--------------------------* 
| Attraction:              | 
|                          | 
| constructors:            | 
|  zero parameter <-------------* 
|                          |    | 
|  one parameter  <-----------* | 
|                          |  | | 
*--------------------------*  | | 
  ^                           | | 
  | extends                   | | 
*--------------------------*  | | 
| Movie:                   |  | | 
|                          |  | | 
| constructors:            |  | | 
|  one parameter   -----------* | 
|  three parameter -------------* 
|    ^                     | 
|    |                     | 
|  four parameter          | 
*--------------------------*