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recession
subjectfact 
recessionhas definition Motion (increasing distance) away.has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:29:52.0
is a kind of motion2001-09-27 09:29:52.0
physical processhas domain physics2001-09-27 09:29:38.0