22.58A practical substitution ladder

Take:

Dm7 → G7 → Cmaj7

Version 1

Plain: Dm7 → G7 → Cmaj7

Version 2

Tritone: Dm7 → D♭7 → Cmaj7

Version 3

Backdoor: Fm7 → B♭7 → Cmaj7

Version 4

Diminished: Dm7 → B°7 → Cmaj7

Version 5

Borrowed: Fmaj7 → Fm6 → Cmaj7

All land on C.

Study the difference.