action bits are reversed (left to right)
            to produce bits (right to left) of an even integer value, 2*n. Then formatted
            output functions produce a (signalling) NaN ordinal sequence corresponding
            to the integer value n.
          </li>
<li class="listitem">
            For a quiet NaN value, NaN fraction bits are reversed (left to right)
            to produce bits (right to left) of an odd integer value, 2*n-1. Then
            formatted output functions produce a (quiet) 