8
1
1
1
1  8
1  1
8
1  1  1  7
2  0  1  6
2  1  1  5
2  0  1  4
2  1  1  3
2  0  1  2
2  1  1  1
3  0  0  0

//8 rows, 1 tube line, 1 tube per row, 1 circuit, counter-cross-flow