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This problem falls into the category of mathematics.

This brass vase is very beautiful.

He takes an agnostic stance on religion.

He says 'knowledge is power' and studies hard every day.

Their problem was clearly visible to me, a bystander.

He is making a Rube Goldberg machine at home.

She chose to have an abortion.

He is known for his faithfulness to his work.

The epicenter is located about 100 kilometers southeast of Tokyo.