Load two shuttle with same color of your choice.  DMC
perle coton size 8 was used on this sample.
abbreviations:
LR=large ring
"-"=picot
SC=split chain
CH=chain
"+"=join
cl r=close ring
rw=reverse work
LR: 21 picots separated by 2 ds, cl r, rw
SC: 2-2-2-2-2-2-2/join thread to 9th p of LR, 2-2-2
CH: 2-2-2-2-2-2-2-2-2-2-2, join to base of LR.
SC: 2-2-2-2-2-2-2/join thread to 13th p of LR, 2-2-2
SC: 2-2-2-2-2-2-2-2-2/join thread to base of LR,
      2-2
CH: 3, lock stitch, 8, join at base of LR, 8, lock stitch,3
Join threads to 9th picot of outside chain.
Tie and work in ends.