| u is (the locus of) a coordinate component curve: C1 = S2S3, C2 = S1S3, and C3 = S2S1.
The CS type surface and CS type 2D cases:
If F is the generating function of a CS of CS type surface or CS type 2D, D is the CS domain, and u = (u0, v0) is in the interior of D, then the 1st- and 2nd-coordinate component curve at u is parametrically specified, respectively, by the following smooth functions:
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 , and
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The domain for C1 is the connected component of  which contains u0.
The domain for
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