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b2-43 -- b3-9 1a 15 29 76
b3-10 -- b3-16 1b 7 14 7 14
b3-17-- b3-23 1c 7 7
b3-24-- b3-34 2a 12 (11) 25
b3-35-- b3-41 2b 7 14 6 13
b3-42-- b4-1 2c 7 7
b4-2-- b4-9 3a 9 (8) 22
b4-10-- b4-16 3b 7 14 6 13
b4-17-- b4-23 3c 7 7
b4-24-- b4-38 4a 15 29 116
b4-39-- b4-45 4b 7 14 7 14
b4-46-- b5-1 4c 7 7
b5-2-- b5-46 5a 46 (45) 59
b5-47 -- b5-53 5b 7 14 6 13
b5-54 -- b6-3 5c 7 7
b6-4 -- b6-18 6a 15 29
b6-19 -- b6-25 6b 7 14 7 14
b6-26-- b6-32 6c 7 7

Blue information is 'secured', red = possible alternatives. The red alternatives do not move the numbers in the two rightmost columns.

Blue 'b' + 'c' gives: 14 + 13 + 13 + 14 + 13 + 14 = 40 + 41 = 81 = 27 + 27 + 27 = 3 * 27 = 34

Blue 'a' gives: 16 + 12 + 9 + 15 + 46 + 15 = 113 = 37 + 76 = 28 + 24 + 61 = 52 + 61 = 28 + 85 = 16 + 21 + 61 + 15

Red 'b' + 'c' gives: 6 * 14 = 84 = 42 + 42 = 28 + 28 + 28 = 7 * 12

Red 'a' gives: 16 + 11 + 8 + 15 + 45 + 15 = 110 = 35 + 75 = 27 + 23 + 60 = 50 + 60 = 27 + 83 = 16 + 19 + 60 + 15