Mata podi help ekak one......
Mekai scene eka....
api hithamu,
There are 2 rows,each row there are 8 students
row 1 = A,B,C,D,E,F,G,H
row 2 = I,J,K,L,M,N,O,P
The 1st row person swap his paper with the person behind him in the 2nd row(vertical pass)(swap n = n+8)
Then again that paper will be...