for a database like PostgreSQL. It’s a very superficial overview, and after
declarations, and then apply this diff to the global map.
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54，详情可参考体育直播
A filled torus (a doughnut) is a 3-manifold homeomorphic to \(S^1 \times D^2\), where \(D^2\) is the 2-dimensional disk. There exists a deformation retract from the doughnut to a circle, so the fundamental group of the doughnut is \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).
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