Start with a magic ring.
R1: 3 ch, 2 dc
R2: turn, (in the same st: 3 ch, 2 dc), 3 dc in the same st
R3: turn, (in the same st: 3 ch, 2 dc), (3 dc in the same st) * 2 times
R4: turn, 1 ch, 3 ss, ( in the same st: 3 ch, 2 dc), 3 dc in the same st
R5: turn, (in the same st: 3 ch, 2 dc), (3 dc in the same st) * 2 times
R6: turn, (in the same st: 3 ch, 2 dc), (3 dc in the same st) * 3 times
R7: turn, 1 ch, 3 ss, (in the same st: 3 ch, 2 dc), (3 dc in the same st ) * 2 times
R8: turn, (in the same st: 3 ch, 2 dc), (3 dc in the same st) * 3 times
R9: turn, (in the same st: 3 ch, 2 dc), (3 dc in the same st) * 4 times, 1 ch