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I read Nobuo Sakai 'Bunmeiwokaeta Shokubutsutachi' (NHK books.)
There was a famine in Ireland in the middle of 19th century.
It is because of a potato failure caused by its disease.
Many people emigrated to the United States of America.
Some presidents of America are the descendants of them.
The hiiragi_mokusei hedge is trimmed.