Every D/C# position on bass, with the songs that play it.
x-4-0-2
x-4-4-2 (fret 2)
x-4-4-x (fret 4)
9-9-7-7 (fret 7)
9-9-x-11 (fret 9)
x-x-11-11 (fret 11)
x-16-16-14 (fret 14)
x-16-16-x (fret 16)