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C. Was there any periodicity in the distribution of dry intervals between 1850 and 1990, or were they random? If they are cyclical, can you

C. Was there any periodicity in the distribution of dry intervals between 1850 and 1990, or were they random? If they are cyclical, can you find a period of oscillation between dryer and wetter years? If cannot find any regular recurrence of dryer periods, state that they are random

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