#slit  a long narrow opening
  supertype:  #opening.artifact  a vacant or unobstructed space; "they left a small opening for the cat at the bottom of the door"
  subtype:  #jag.slit  a slit in a garment that exposes material of a different color underneath; used in Renaissance clothing
  subtype:  #slot.slit  a small slit (as for inserting a coin or depositing mail)
     subtype:  #coin_slot  a slot through which coins can be inserted into a slot machine
     subtype:  #mail_slot  a slot (usually in a door) through which mail can be delivered

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