"Employment" does not include services performed by a nonresident alien individual for the period such individual is temporarily present in the United States as a nonimmigrant under subparagraph (F), (J), (M), or (Q) of section 101 of the federal "Immigration and Nationality Act", 8 U.S.C. sec. 1101 (a)(15), as amended, to carry out any purpose specified in subparagraph (F), (J), (M), or (Q) of section 101 of such federal act.