In addition to the casebook, the rule book has the same note
RULE 3, SECTION 1, ART. 1
Each team consists of five players, one of whom is the captain.
NOTE: A team must begin the game with five players, but if it has no substitutes to replace disqualified or injured players, it must continue with fewer than five. When there is only one player participating for a team, the team shall forfeit the game, unless the referee believes that team has an opportunity to win the game.
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