NavigableMap.html" title="class or interface in java.util" class="external-link">NavigableMap</a>&lt;<a href="../../tuple/Tuple2.html" title="class in io.permazen.tuple">Tuple2</a>&lt;<a href="../Index4.html" title="type parameter in Index4">V1</a>,<wbr><a href="../Index4.html" title="type parameter in Index4">V2</a>&gt;,<wbr><a href="../Index2.html" title="interface in io.permazen.index">Index2</a>&lt;<a href="../Index4.html" title="type parameter in Index4">V3</a>,<wbr><a href="../Index4.html" title="type