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Prelims, though technically required in the manual, are inherently a local preference, or sometimes a preference of the individual official when he/she feels some "on-the-spot" information is advisable.
See how many preliminary signals you see when watching NCAA BB on TV. You don't see too many.
Likewise in HS, you won't see too many unless locally expected. When I worked in KS, the state coordinator wanted them, so we used them. Sounds like that's the case in AZ as well. But I would say in most places they are not strictly mandated.
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