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Rule 8-4-1g

8-4-1. The batter is out when:
g. He runs outside the three-foot running lane (last half of the distance from home plate to first base), while the ball is being fielded or thrown to first base.
  1. This infraction is ignored if it is to avoid a fielder who is attempting to field the batted ball or if the act does not interfere with a fielder or a throw.
  2. The batter runner is considered outside the running lane lines if either foot is outside either line.