ss=identifier>indexed_by</span><span class=special>&lt;</span>
    <span class=identifier>hashed_non_unique</span><span class=special>&lt;</span> <span class=comment>// indexed by quadrant coordinates</span>
      <span class=identifier>composite_key</span><span class=special>&lt;</span>
        <span class=identifier>street_entry</span><span class=special>,</span>
        <span class=identifier>member</span><span class=special>&lt;</span><span class=identifier>street_entry</span><span class=special>,</span