I_CONGRUENT)
     <span style="color: #b22222;">! </span><span style="color: #b22222;">Communicators have the same group and rank order, but they differ in context</span>
  <span style="color: #a020f0;">case</span> (MPI_SIMILAR)
     <span style="color: #b22222;">! </span><span style="color: #b22222;">Rank order is different</span>
     <span style="color: #a020f0;">call</span> <span style="color: #0000ff;">die</span>(<span style="color: #8b2252;">"Different rank order in communicators"</span>)
  <span styl