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Published in Brain Teasers
B, A, S. The letters are the first initials of the host cities for the Summer Olympics through the 20th century:
Saint Louis, London, Stockholm, Antwerp, Paris, Amsterdam, Los Angeles, Berlin, London, Helsinki, Melbourne, Rome, Tokyo, Mexico City, Munich, Montreal, Moscow, Los Angeles, Seoul, Barcelona, Atlanta, Sydney
Today's brain teaser courtesy of Braingle.com.