○○○furnace⪢⪢
It's a two-foot gap beneath the floor supported by pillars into which warm air would rush from a furnace in the corner of the room.
http://qindex.info/i.php?x=11837
○○○agenda⪢⪢
Tax reform is the cornerstone of the Republicans' agenda. The word agenda, in this case, means a plan of things to be done.
http://qindex.info/i.php?x=15826
○○○ furnace ⪢⪢
