s = 'abababab' n = 1 ans = 'abababab'

size = 8 s = 'abababab' n = 2 a a a a b b b b

count = 0 level = 0 i = 0 ls = (size / n) # lineSize

0 2 4 6 8 1 3 5 7

i = 1 level = 1 c = 0 x = n * ls + level ()

if (i = 2 % ls == 0) => c += 1, level = 0 c = 1 x = c * ls + level (2)

i = 3 level += 1 = 1 x = c * ls + level (3)

size = 8 s = 'abababab' n = 3

a a b b b b a a

0 4 1 3 5 7 2 6