flow.size: 8
row.1: 0,0,0,0,7,0,0,5
row.2: 0,5,0,0,0,0,0,7
row.3: 0,0,0,0,0,0,0,1
row.4: 0,0,0,0,0,0,0,0
row.5: 0,4,0,0,0,0,0,0
row.6: 0,6,4,2,0,0,0,2
row.7: 0,0,0,0,0,3,0,6
row.8: 0,0,0,0,1,0,0,3












