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Memorandum
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In the park covered with snow, several people were enjoying walk.
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At an open-air stage with roof at the lowest part of this park, a boy was
exercising juggling with a football.
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Many crows were cawing vigorously since I prepared the recording. Some birds
were twittering, too.
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The monitoring post at this park showed 0.137 μSv/h. (right picture).
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