NFHS:
As long as the center is on the end of the line and wearing an eligible number, 1-49, 80-99, he is eligible. In HS you can not be "declared". Numbers and position are the controling factors.
A number of schools run the "swinging gate". Everybody but the center kicker & holder line up to one l side of the center. If B does not adjust A runs the ball, usually a pass to the center. Now every team expects it so it doesn't happen all that often.
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Steve
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