what is the drug formulation of somatropin with a strength more than 6.4?
(AND medicine.drug_formulation (AND (JOIN (R medicine.drug_strength.drug_formulations) (ge medicine.drug_strength.strength_value 6.4^^http://www.w3.org/2001/XMLSchema#float)) (JOIN (R medicine.drug.marketed_formulations) m.0hqvklw)))