Rule 18 covers taking relief under penalty of stroke and distance. When your ball is lost outside a penalty area or comes to rest out of bounds, the required progression of playing from the teeing area to the hole is broken; you must resume that progression by playing again from where the previous stroke was made. This rule also covers how and when a provisional ball may be played to save time when your ball in play might have gone out of bounds or be lost outside a penalty area.
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