Embellishments

[nek serep]

Clementi's Gradus, the Max Vogrich edition, #9, in B flat, embellishments at bars 12,13, 15, 16. Do I play Gb Ab Gb Ab, then F Gb Bb ? Or is it Gb Ab Gb, then F Gb Bb?  The second way sounds better, and that is supposedly the criteria for embellishments, but I'd like to know the correct way; also how in the world is it counted, does the F Gb take two sixteenths (as written), or just one sixteenth, or does it perhaps fit after the A and before the Bb in the Bass clef below? Sorry for the awkward, non-standard  form of this question.