# tasks 3
# buffers 
0(0, 1, 1) 
1(1, 2, 2)
2(2, 1, 3) 
# operations 
0(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)
1(1,2,1,2,1,2,0,2,1,2,1,2,1,2,1)
2(1,2,1,2,1,2,1,2,1,2,1,2,1,2,1)