I wouldn't describe it so much as a natural need to repeat -- rather that we use references to link concepts.<p>e.g.<p><pre><code>    I have an allergy attack.
    Allergy medication will relieve an allergy attack.
    I desire allergy medication.
    I will go to the drug store and ask for allergy medication.
</code></pre>
The underlying model consists mainly of the concepts of allergy, attack, and medication.  These concepts are repeated several times, because we are describing relationships between them.  Note that each use adds significant new information.<p>However, the sense of <i>repeat</i> used in the submitted article rather concerns redundancy, whereby the concept itself or a particular relationship is repeated in a redundant manner, without adding new information.  This is merely to prevent miscommunication.