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Combination

Phase I

levonorgestrel 0.15 mg + ethinyl estradiol 20 mcg

Phase II

levonorgestrel 0.15 mg + ethinyl estradiol 25 mcg

Phase III

levonorgestrel 0.15 mg + ethinyl estradiol 30 mcg

Phase IV

ethinyl estradiol 10 mcg