Most discussed of seven football rule changes this year are two:
¶ A player withdrawn for a substitute in any period may return to the game in any subsequent period, instead of waiting till the next half.
¶ When any part of a ball-carrier's body except his hands or feet touch the ground, the ball is dead.
Other new rules prohibit "diving" tackles, flying wedge formation on the kickoff, substitutions except for injury unless time-out has been called for some other reason, hard knee or elbow pads, "striking" with the hand...
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