network of beacons
... that a network of beacons in Okinawa helped enforce the Tokugawa policy of "national seclusion"?
... that a <b id="mwA7k"><a href="./Sakishima_Beacons" id="mwA7o" rel="mw:WikiLink" title="Sakishima Beacons">network of beacons</a></b> in <a href="./Okinawa_Prefecture" id="mwA7s" rel="mw:WikiLink" title="Okinawa Prefecture">Okinawa</a> <i id="mwA7w">(pictured on <a class="mw-redirect" href="./Taketomi" id="mwA70" rel="mw:WikiLink" title="Taketomi">Taketomi</a>)</i> helped enforce the <a href="./Tokugawa_shogunate" id="mwA74" rel="mw:WikiLink" title="Tokugawa shogunate">Tokugawa</a> policy of "<a href="./Sakoku" id="mwA78" rel="mw:WikiLink" title="Sakoku">national seclusion</a>"?