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    1. first refused because there are no tables for one (+1)
    2. second refused for the same reason (+1)
    3. third and four accepted because there is an available table for two (+0).

    Finally, there is one empty table for two and another one used for ne group of two clients.

    The first and second clients may have been proposed a table for two if a > 0 and if all tables for one were used.

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