Tonic C♭-major; dominant (G♭-major) of C♭-major; use the 1st inversion of this G♭-major (chord of the sixth b♭ d♭ g♭), which is at the same time chord of the Neapolitan sixth in F-major; dominant (C-major) of F-major; use the 1st inversion of this C-major, (chord of the sixth e g c), which is at the same time chord of the Neapolitan sixth in B-major; tonic B-major, which B-major is at the same time sub-dominant in F♯-major, or if modulating to f♯-minor, chord of the Dorian sixth in f♯-minor. (Cadence!)
Tonic C♭-major; dominant (G♭-major) of C♭-major; use the 1st inversion of this G♭-major (chord of the sixth b♭ d♭ g♭), as it is at the same time chord of the Neapolitan sixth in F-major; dominant (C-major) of F-major; use the 1st inversion of this C-major (chord of the sixth e g c), which is at the same time the chord of the Neapolitan sixth in B-major; tonic B-major; dominant (F♯-major) of B-major; use this F♯-major, which is sub-dominant in C♯-major (or chord of the Dorian sixth in c♯-minor). (Cadence!)
Tonic C♭-major; dominant (G♭-major) of C♭-major; use the 1st inversion of this G♭-major (chord of the sixth b♭ d♭ g♭), which is also the chord of the Neapolitan sixth in F-major; tonic F-major; relative (d-minor) to the tonic d-minor; use this d-minor as tonic; dominant (A-major) of d-minor; use the 1st inversion of this A-major (chord of the sixth c♯ e a), which is at the same time the chord of the Neapolitan sixth in G♯-major (g♯-minor). (Cadence!)