these rules as a convenience in our programs as we
will see in a moment. The rules both keep us from making mistakes and make
it simpler to write some of our code.<br />
<br />
In essence, in creating this <tt>Follows</tt> table, we are modelling a 
"relationship" where one person "follows" someone else
and representing it with a pair of numbers indicating that (a) the people are
connected and (b) the direction of the relationship.<br />
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