; and (iii) considers 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. (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. .