Imitative, polyphonic polythematic fantasia of 103 compases. In three sections with considerable relationship between them. It is the third of the group of fourpieces, fu095–fu098, that use this scordatura, with the sixth course lowered one whole tone.
I: (1-31) Theme 1 imit S / T / A – B – free – S (part) – free – B – K. not paired theme
II: (31-62) Themes 2+3+4 Theme 2 based on 1, used in voice pair with 3. 4 is a variant of the head of 3. S/A (2+3) – T/B (2+3) – S/A (2+3mod) >> 4 suelto imitations >> K.
III (62 – 103) – Themes 5 a+b, 6. 5 a+b are variants of each other.
T 5a / A 5b / S5b / T5a / A5a mod / B 5a >> 6 B/A >> free >> 6 >> free K.

Structure seems to be 3 sections of 31 compases each + 10 compases of coda. Sections I & II are clearly both 31 compases + last complete statement of 6 occurs (concludes) at 93. Free material at end of section III is based on fragments of theme.
This is a fine work, closely worked out, manageable and attractive.