489 A A O P N example in use from 20 to 23 cm high 4 A: Strip 20x50 12 5/3 P: Strip 23x50 R2 N: Transition right 20x50 12 5/3 -> 23x50 R2 O: Transition left 23x50 R2 -> 20x50 12 5/3 streetline edge courses
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