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There's nothing per se illegal about a one handed set provided there's no prolonged contact and the ball does not visibly come to rest.
Although, except for the "one-handed fist poke" or the "fake jump set and dump" techniques, I'd think it difficult to actually perform a one-handed set WITHOUT having a lift.
Still, if the setter can do it without prolonged contact or visibly coming to rest, it's certainly legal.
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