arl ),
|    ( ken    ),( earl ),( rick ),( ol    ),( neal  ),( dave ))
|
|   ( jets , sharks )
|
|   ( jets ,
|    ( art    ),( al   ),( sam  ),( clyde ),( mike  ),
|    ( jim    ),( greg ),( john ),( doug  ),( lance ),
|    ( george ),( pete ),( fred ),( gene  ),( ralph ))
|
|   ( sharks ,
|    ( phil ),( ike  ),( nick ),( don ),( ned  ),( karl ),
|    ( ken  ),( earl ),( rick ),( ol  ),( neal ),( dave ))
|
|   (( 20's ),( 30's ),( 40's ))
|
|   ( 20's ,
|    ( sam    ),( jim  ),( greg ),( john ),( lance )