The Cm arpeggio pattern starts at the 3rd fret of the 3rd string.
Memorize the minor arpeggio chord pattern so that you can play it in any key. Example 21 uses the minor chord arpeggio throughout the whole progression.
The only difference between the major chord and the minor chord is the flattened third note.
The minor seventh chord is created by adding a flattened seventh note to the minor chord.