de>
    followed by one or more characters specifying what kind of argument to
    read or print,</li>
<li><em>formatting indications</em>, introduced by the special character <code class="code"><span class="string">'@'</span></code>
    followed by one or more characters specifying how to read or print the
    argument,</li>
<li><em>plain characters</em> that are regular characters with usual lexical
    conventions. Plain characters specify string literals to be read in the
    input or printed in the out