Cavern-Tunnel Passage Set A (Large Cavern)

Publisher's blurb: The Cavern-Tunnel Passage (large cavern) group of Naked Geomorphs contains 18 tiles, each with one three-or-more position opening (CSD, CSSD, etc.) and a connected tunnel opening (T), with the remaining positions filled with rock (R). Sets A and B are completely interchangeable. I.e., tile M13A can be replaced with tile M13B, without changing the basic structure of your map. Set A has sections of narrow, one-hex wide, passages.