#enclosed_space__cavity  space that is surrounded by something
  supertype:  space.amorphous_shape  an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"
  subtype:  hollow  a cavity or space in something; "hunger had caused the hollows in their cheeks"
  subtype:  pouch.enclosed_space__sac__sack__pocket  an enclosed space

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