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I tried to cut out a hole for my mask but the inside turn out to be hollow. How do I fill in the gap so that the hollow inside won't show
![How will you retopologize this? (Between a circle and square) [Pic Attaced] - Modeling - Blender Artists Community](https://media.blenderartists.org/uploads/default/original/4X/f/e/8/fe873a5fb5e21991e9b4ea6859a7165d9d966327.png "How will you retopologize this? (Between a circle and square) [Pic Attaced] - Modeling - Blender Artists Community")