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Interlocking Rules

 STOP (RULE 601A)

 APPROACH (RULE 601B-SEMAPHORE)

 APPROACH (RULE 601B-COLOR LIGHT)

 CLEAR (RULE 601C)

 MEDIUM-APPROACH (RULE 601D)

 APPROACH MEDIUM (RULE 601E)

 CLEAR-MEDIUM (RULE 601F)

 RESTRICTING (RULE 601G-SEMAPHORE)

 RESTRICTING (RULE 601G-COLOR LIGHT)

 CLEAR-SLOW (RULE 601H-SEMAPHORE)

 CLEAR-SLOW (RULE 601H-COLOR LIGHT)

 STOP (RULE 601A-SMASH BOARD)

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