Extrude the selection by 25 units with Extrusion Type set to Group.
The glass is almost done, we just need to smooth it a bit. Go to Edge selection mode and select all edges using Ctrl + A. Chamfer them 0.2 units.
Finally add a MeshSmooth modifier with Iterations set to 3. Your glass will look even better after you assign it a glass material, but will this will be covered in a future tutorial.
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