CE1 - - Close Encounters of the First Kind - sightings close enough, whether day or night, to make out details of an unidentified object
CE2 - - Close Encounters of the Second Kind - differs from encounters of the first kind in that the object creates physical effects or leaves a visible record
CE3 - - Close Encounters of the Third Kind - humanoid entities are reported, usually but not always in connection with a report of an unidentifiable object
CE4 - - Close Encounters of the Fourth Kind - reports of being involuntarily abducted by humanoids, most commonly while sleeping or driving alone late at night
CR - - Accounts of crashed discs and their retrieval
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