>
     <li>
      <p>
       a) Accompany it with the complete corresponding machine-readable
       source code, which must be distributed under the terms of Sections
       1 and 2 above on a medium customarily used for software interchange; or,
      </p>
     </li>
     <li>
      <p>
       b) Accompany it with a written offer, valid for at least three years,
       to give any third party, for a charge no more than your cost of
       physically performing source distribution, a complete machine-reada