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<h1>Boolean expressions: AND and OR</h1>
<p>The expression <code>E1 and E2</code> returns true if the <i>effective boolean values</i> of
<code>E1</code> and <code>E2</code> are both true.</p>
<p>The expression <code>E1 or E2</code> returns true if the <i>effective boolean values</i> of
either or both of <code>E1</code> and <code>E2</code> are true.</p>
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