b22222;">! </span><span style="color: #b22222;">there is implicit renumbering at the time of group creation</span>

      <span style="color: #a020f0;">call</span>  <span style="color: #0000ff;">MPI_Comm_group</span>( bridge_comm, basegroup, ierr )
      <span style="color: #a020f0;">call</span>  <span style="color: #0000ff;">MPI_Comm_Rank</span>( bridge_comm, myrank, ierr )

      <span style="color: #a020f0;">call</span>  <span style="color: #0000ff;">MPI_Group_Size</span>( g1, nsize1, ierr )
      <span 