Maths ques helppppppppppppppppppp?

in an examination hall there are 4 rows of chairs. each row has 8 chairs one behind the other. there are 2 cles sittin with the examination with 16 students in each cl. it is desired that in each row, all students belong to the same cl and that no 2 adjacent rows are alloted to the same cl. in how many ways can these 32 students be seated??