MUŞ At a primary school in the eastern province of Muş , an unusual sight greets teachers and visitors alike: A total of 21 pairs of twins studying under the same roof. With 1,742 students, Vali Adil Yazar Primary School is one of the largest in the city and stands out for its highly unusual student profile. Many of the 42 children are identical twins, making it difficult at times for teachers and classmates to tell them apart. The situation has brought both joy and confusion to the classrooms.