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01. graph
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Dictionary entry of the hour:
orientable surface
    topology:
    The closed orientable surfaces are the sphere (`S_0`), the torus (`S_1`), the double torus (`S_2`), the triple torus (`S_3`), ... generally `S_g` where g is a genus.
    
    Each one of closed orientable surfaces can be obtained by adding some handles to ...


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