> insert  1000 300 Hoboken

This is successful.  All of the trees now have a single node.

>  insert 25 400     Blacksburg   

This is successful

> remove  3 Hoboken

This is successful.

>     list  1

List out the population tree.

> makenull

Reinitialize the database

> insert  1000 300 Hoboken

OK.

>  insert  25  400     Blacksburg   

OK.

> insert 1000  500 Reject

Reject because of duplicate in first field.

> insert 30 500 Christiansburg

OK.

>   list 3

List the 3rd tree.  It should appear as follows:

    25 400 Blacksburg   
30 500 Christiansburg
    1000 300 Hoboken