You are given 4N doubles tennis players for some N>0.  Say they are
numbered 1,2,...,4N.  A game of doubles is
a 2-set of two 2-sets. {{A,B},{C,D}}, where A thru D are distinct
players.  Here the team of players A and B plays against the team of C
and D.  Your algorithm must print 4N-1 games that meet the following
constraints:
1.  Each player plays exactly two games against each other player.
2.  Each player has each other player as a teammate exactly once.

For example, if N=1, we'd have the 3 games

{{1,2},{3,4}}
{{1,3},{2,4}}
{{1,4},{2,3}}

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