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












