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Check that the following is in the Name/Type list:

Additionally, click on show labels. You should now be able to see each of the boundary names on the respective edges in the Graphics Window. Verify that the boundary types specification is correct.

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Type in pipe100x30.msh for the File Name:. Select Export 2d Mesh since this is a two-dimensional mesh. Click Accept.

Check that pipe100x30.msh has been created in your working directory.

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