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2 , substituted provisions permitting the Secretary to accept original enlistments of persons for the duration of their minority or for a period of two , three , four , five , or six years , for provisions which limited the Secretary to accept original enlistments from male persons for the duration of their minority or for a period of two , three , four , five , or six years , and from female persons for a period of two , three , four , five , or six years . Thus , participation by a producer in an environmental credits program not only serves to finance pollution prevention and abatement measures but may also act as a shield from environmental enforcement activity for the duration of the program . On the other hand , according to a study by the Small Business Administration ( SBA ) , reducing marginal income-tax rates increases entrepreneurial start-ups , decreases exits from entrepreneurship , and lengthens the duration of entrepreneurial ventures . If you are found suitable for practice / migration in Australia following successful completion of the Stage I - Desk Top Audit you will generally need to undergo a practice audit of six months duration ( Stage II ) . We discuss three aspects of this : intervention duration , complex mechanisms for access and gender bias in front-line delivery .