17. OUT OF ORDER OF SERVING, RECEIVING OR ENDS

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17.1 If by mistake the players have not changed ends when ends should have been changed, play shall be interrupted as soon as the error is discovered and the players shall change ends.

17.2 If by mistake a player serves or receives out of his turn, play shall be interrupted and shall continue with that player serving or receiving who, according to the sequence established at the beginning of the match, should be server or receiver respectively at the score that has been reached.

17.3 In any circumstances, all points scored before the discovery of an error shall be reckoned.