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Read rule 2.
2-40-2:
"The snap begins when the snapper first moves the ball legally other
than in adjustment. In a snap, the movement must be a quick and continuous
backward motion of the ball during which the ball immediately leaves the hand(s)
of the snapper and touches a back or the ground before it touches an A lineman."
Also, see 7-2-4:
"A snap shall be such that the ball immediately leaves the hand or
hands of the snapper and touches a backfield player or the ground before it
touches an A lineman. A scrimmage down must start with a legal snap. An illegal
snap causes the ball to remain dead."
If the snapper fails to release the ball, it's an illegal snap. Dead ball enforcement (7-1-4), 5 yards, replay the down.
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