; and (iii) consider whether the teacher has substantial teaching experience in the school in which the teacher is employed or in a school that is similar to the school in which the teacher is employed; (C) shall use the grant funds to pay for costs of training and supporting teacher leaders for not less than 2 years and not more than 3 years; (D) may use the grant funds to pay for a portion of a stipend for teacher leaders if such grant funds are matched by additional non-Federal public or private funds as follows: (i) during each of the first and second years of the grant period, grant funds may pay not more than 50 percent of such stipend; and (ii) during the third year of the grant period, grant funds may pay not more than 33 percent of such stipend; and (E) may require teacher leaders to pay back the cost of attaining a credential if they do not complete their term of service in the teacher leader development program. .