Variations on Intermediate Sudoku Logic Puzzles (Vol 1) 
 Chapter 14: Four Easy Sudoku-7B-2V Puzzles (numbers 69-72) 
 
-  Step-by-step instructions for solving  Puzzle 69, (24/49)   Diff: 3/972
 -  Step-by-step instructions for solving  Puzzle 70, (27/49)   Diff: 3/992
 -  Step-by-step instructions for solving  Puzzle 71, (33/49)   Diff: 4/9991
 -  Step-by-step instructions for solving  Puzzle 72, (34/49)   Diff: 4/9991