M.А.А. Frah1, V.V. Belyaev2, A.B.N. Mustafa3, A.A. Belyaev4

1,2 Peoples' Friendship University of Russia (Moscow, Russia)

1,3 Al Neelain University (Khartoum, Sudan)

2,4 State University of Education (Moscow, Russia)

1 sounak_ali@yahoo.com, 2 vv.belyaev@guppros.ru, 4 aa.belyaev@guppros.ru