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What is characteristic of an occulting light?
A) 1 sec. flash, 2 sec. eclipse, 1 sec. flash, 5 sec. eclipse
B) 5 sec. flash, 5 sec. eclipse
C) 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse
D) 6 sec. flash, 6 sec. eclipse
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