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5 players, 2 players vs 2 players in a tournament

Source: JBMO 2009 Shortlist C2

October 14, 2017
JBMOcombinatoricsexamples

Problem Statement

Five players (A,B,C,D,E)(A,B,C,D,E) take part in a bridge tournament. Every two players must play (as partners) against every other two players. Any two given players can be partners not more than once per a day. What is the least number of days needed for this tournament?
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