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<p>It is good practice to begin with a clean session to make sure that you do not have extraneous items there when you begin your work. The best practice is to restart the <code>R</code> session, which can be accomplished for example with <code>command/ctrl + shift + F10</code>. An alternative to <em>only</em> purge user-created objects from memory is to use the <code>R</code> command <code>rm</code> (for “remove”), followed by a list of it