Challenging Sudoku Seven Logic Puzzles (Vol 1) 
 Chapter 11: Fourteen Challenging (DiffLev 13) Sudoku-7C Puzzles (numbers 109-122) 
 
-  Step-by-step instructions for solving  Puzzle 109, (34/49)   Diff: 13/3.11AA.1112.4684
 -  Step-by-step instructions for solving  Puzzle 110, (35/49)   Diff: 13/2.2123.2222.3662
 -  Step-by-step instructions for solving  Puzzle 111, (36/49)   Diff: 13/5.2112.1124.5552
 -  Step-by-step instructions for solving  Puzzle 112, (36/49)   Diff: 13/3.3112.1112.4872
 -  Step-by-step instructions for solving  Puzzle 113, (36/49)   Diff: 13/3.2232.4333.3332
 -  Step-by-step instructions for solving  Puzzle 114, (37/49)   Diff: 13/2.2221.1343.2474
 -  Step-by-step instructions for solving  Puzzle 115, (37/49)   Diff: 13/2.1211.1234.7571
 -  Step-by-step instructions for solving  Puzzle 116, (38/49)   Diff: 13/4.521B.3352.3332
 -  Step-by-step instructions for solving  Puzzle 117, (38/49)   Diff: 13/4.3443.3212.2433
 -  Step-by-step instructions for solving  Puzzle 118, (38/49)   Diff: 13/4.2333.1A13.5444
 -  Step-by-step instructions for solving  Puzzle 119, (38/49)   Diff: 13/2.1A11.1134.6764
 -  Step-by-step instructions for solving  Puzzle 120, (38/49)   Diff: 13/1.1333.4423.4343
 -  Step-by-step instructions for solving  Puzzle 121, (39/49)   Diff: 13/3.13A2.2244.6551
 -  Step-by-step instructions for solving  Puzzle 122, (39/49)   Diff: 13/2.2134.1123.5744