Question: Separate a table into two Tables?

Hi everyone,

I've been having a problem with this question:

"The system of cities and roads in Connected Graphs on page 246 splits naturally into two components: the Canadian cities and roads between them, and the European cities and roads between them. In each component you can travel between any two cities, but you cannot travel between the two components. Write a procedure that, given a table of neighbors, splits the system into such components. Hint : Think about the form in which the procedure returns its result."

I have to separate a table into two tables based on the connectivity of the cities, that is, I want a table just for the cities from Canada and another one for the cities from Europe. Can anyone help me with this? I really have no idea how to tell Maple what I want it to do.

Anyway, here's the link with the soon-to-be program:

6.9.mw