@interface HKPotentiallyNonConvertibleMassUnit : HKBaseUnit - (id)_unitByPrefixing:(id)a0 withConversionConstant:(id)a1; @end
@interface HKPotentiallyNonConvertibleMassUnit : HKBaseUnit - (id)_unitByPrefixing:(id)a0 withConversionConstant:(id)a1; @end