done step 1 and 2
going to do step 3

**************
*  Question  *
**************
 --- Sudoku 9x9 ---
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 . . . 4 1 9 . . 5
 . . . . 8 . . 7 9
known cells count: 30

**************
*   Step 1   *
**************
--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{2489}
row#2:{},{247},{247},{},{},{},{3478},{234},{2478}
row#3:{12},{},{},{23},{34},{24},{13457},{},{247}
row#4:{},{125},{1259},{579},{},{14},{4579},{2459},{}
row#5:{},{25},{2569},{},{57},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{139},{},{134579},{357},{357},{},{},{},{49}
row#8:{23},{278},{237},{},{},{},{36},{3},{}
row#9:{1239},{1245},{123459},{2356},{},{26},{13469},{},{49}
possible value count:160

single possible value: 
  cell[71]=3 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 . . . 4 1 9 .*3 5
 . . . . 8 . . 7 9
known cells count: 31
note: * is newly added
  cell[71]=3 is newly added

**************
*   Step 2   *
**************
--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{2489}
row#2:{},{247},{247},{},{},{},{3478},{24},{2478}
row#3:{12},{},{},{23},{34},{24},{13457},{},{247}
row#4:{},{125},{1259},{579},{},{14},{4579},{2459},{}
row#5:{},{25},{2569},{},{57},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{139},{},{134579},{357},{357},{},{},{},{49}
row#8:{2},{278},{27},{},{},{},{6},{},{}
row#9:{1239},{1245},{123459},{2356},{},{26},{1469},{},{49}
possible value count:154

single possible value: 
  cell[64]=2 
  cell[70]=6 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
*2 . . 4 1 9*6 3 5
 . . . . 8 . . 7 9
known cells count: 33
note: * is newly added
  cell[64]=2 is newly added
  cell[70]=6 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{2489}
row#2:{},{247},{247},{},{},{},{3478},{24},{2478}
row#3:{1},{},{},{23},{34},{24},{13457},{},{247}
row#4:{},{125},{1259},{579},{},{14},{4579},{2459},{}
row#5:{},{25},{2569},{},{57},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{139},{},{134579},{357},{357},{},{},{},{49}
row#8:{},{78},{7},{},{},{},{},{},{}
row#9:{139},{145},{13459},{2356},{},{26},{149},{},{49}
possible value count:145

single possible value: 
  cell[19]=1 
  cell[66]=7 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
*1 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 2 .*7 4 1 9 6 3 5
 . . . . 8 . . 7 9
known cells count: 35
note: * is newly added
  cell[19]=1 is newly added
  cell[66]=7 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{26},{},{2468},{1489},{1249},{2489}
row#2:{},{247},{24},{},{},{},{3478},{24},{2478}
row#3:{},{},{},{23},{34},{24},{3457},{},{247}
row#4:{},{125},{1259},{579},{},{14},{4579},{2459},{}
row#5:{},{25},{2569},{},{57},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{39},{},{13459},{357},{357},{},{},{},{49}
row#8:{},{8},{},{},{},{},{},{},{}
row#9:{39},{145},{13459},{2356},{},{26},{149},{},{49}
possible value count:136

single possible value: 
  cell[65]=8 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 1 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 2*8 7 4 1 9 6 3 5
 . . . . 8 . . 7 9
known cells count: 36
note: * is newly added
  cell[65]=8 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{26},{},{2468},{1489},{1249},{2489}
row#2:{},{247},{24},{},{},{},{3478},{24},{2478}
row#3:{},{},{},{23},{34},{24},{3457},{},{247}
row#4:{},{125},{1259},{579},{},{14},{4579},{2459},{}
row#5:{},{25},{2569},{},{57},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{39},{},{13459},{357},{357},{},{},{},{49}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{39},{145},{13459},{2356},{},{26},{149},{},{49}
possible value count:135

single possible value: 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 1 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 2 8 7 4 1 9 6 3 5
 . . . . 8 . . 7 9
known cells count: 36
note: * is newly added

**************
*   Step 3   *
**************
 ... doing