<arg choice="opt"><option>-I</option></arg>
<arg choice="opt"><option>-O</option></arg>
<arg choice="opt"><option>-f <replaceable>from</replaceable></option></arg>
<arg choice="opt"><option>-I</option></arg>
<arg choice="opt"><option>-O</option></arg>
<arg choice="opt"><option>-f <replaceable>from</replaceable></option></arg>