His double personality confuses me.

He bears a double responsibility.

Mr. Nihon is my best friend.

The 24-cell is one of the geometric shapes in four dimensions.

The 正百二十胞體 is one of the regular polytopes in four dimensions.

The 120-cell is one of the regular polytopes in four dimensions.

The 正二十四胞體 is one of the regular polytopes in four dimensions.

He achieved the 'all simples' yaku in mahjong.

The legend of the nine-tailed fox has been passed down from ancient times in Japan.

The nine-banded armadillo is known for its distinctive appearance.