(≥ 1/ 10) (≥ 1/ 100 til, < 1/ 10) (≥ 1/ 1. 000 til, < 1/ 100) (≥ 1/ 10. 000 til, < 1/ 1. 000)
Very common (≥ 1/ 10) Common (≥ 1/ 100, < 1/ 10) Uncommon (≥ 1/ 1,000, < 1/ 100) Rare (≥ 1/ 10,000, < 1/ 1,000)