topology

To describe details of this gluing:

https://d2r55xnwy6nx47.cloudfront.net/uploads/2012/09/Haken_sized_Figure02.jpg

Which vertices are identified together? What is the orientation of the edges that we identify? 

[https://d2r55xnwy6nx47.cloudfront.net/uploads/2012/09/Haken_sized_Figure02.jpg]

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