Input (grade 1): Richards, Tobe A. The Bluegrass Banjo Chord Bible: Open G Tuning 2,160 Chords.
Output (grade 3): Richards, Tobe A. (2006). The Tenor Banjo Chord Bible: CGDA Standard Jazz Tuning 1,728 Chords. The Plectrum Banjo Chord Bible: CGBD Standard Tuning 1,728 Chords.