Level 12/ Color combos?

Have played this level many times; can't figure out the different color combos.
Please help!
PlanetofJanet

Use same color for each pair of large rounds but each pair be different from the others; ie, 2 blue, 2 orange, etc. Do the same thing for the small rounds, but make sure you don't use the same color as the large rounds they are grouped with; ie, if large rounds are blue, don't use blue for small rounds in that group. That seemed to work for me.