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The handiwork and the Kesef Kidushin of a Na'arah belong to her father…
The Gemara states that one may think that a father nay not sell his daughter who is an Ailonis for a maidservant. Tosfos asks that a maidservant is sold when she is a Ketanah and how is it possible for the father to know at that time that she is an Ailonis as she becomes an Ailonis if she has not develop the Simanim of a Na'arah by the age of 20.
Tosfos answers that that we may have thought that the master must return the handiwork to the father and the father must return the money he received for her sale to the master and if the master or his son did Yi'ud (married her) it would not be valid.
We review the scholarship regarding the laster editors (sevaroim) since these first few Blatt are clearly the work of a different (geological) strata of the Gemara.