 Sharks data base.

With a query on the name &quot;ken&quot; we obtain the following
output, giving all the features associated with Ken:

o----------------------------------------------------------------------
|
|   ken
|    sharks
|     20's
|      high_school
|       single
|        burglar
|
o----------------------------------------------------------------------

With a query on the two features &quot;college&quot; and &quot;sharks&quot; we obtain
the following outline of all features satisfying these c