All possible accordion registrations. 1 0 major 4 4 G 2 C4 1 1 quarter 0/0/1 1 C4 1 1 quarter 0/1/0 1 C4 1 1 quarter 0/1/1 2 C4 1 1 quarter 0/2/0 2 C4 1 1 quarter 0/2/1 3 C4 1 1 quarter 0/3/0 3 C4 1 1 quarter 0/3/1 C4 1 1 quarter 1/0/1 C4 1 1 quarter 1/0/0 1 C4 1 1 quarter 1/1/0 1 C4 1 1 quarter 1/1/1 2 C4 1 1 quarter 1/2/0 2 C4 1 1 quarter 1/2/1 3 C4 1 1 quarter 1/3/0 3 C4 1 1 quarter 1/3/1 C4 1 1 quarter empty light-heavy