The rules for a let service in table tennis are as follows:
If the ball served touches the net assembly and then becomes a legal service or is blocked by the receiver or his or her partner, it shall be a let service.
If the ball is served when the receiver or his or her partner is not ready and neither the receiver nor his or her partner attempts to hit the ball, it shall be a let service.
If, due to interference beyond the player's control, a player fails to serve legally, return the ball legally or comply with the rules, it shall be a let service.
If the umpire or assistant umpire suspends the game, it shall be a let service.
In doubles, if there is a mistake in serving or receiving, it shall be a let service.
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