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The stupid puzzle...
20 yellow lines
8 light yellow lines
28 total

all columns labeled 1-7 down

the last yellow numbers are 5, 3, 6, 7, 5
the first yellow numbers are 1, 1, 5, 3, 1

20 + 5 + 3 + 6 + 7 + 5 = 46
+ 1 + 1 + 5 + 3 + 1 = 57
- 8
=49

all yellow numbers are
1, 2, 3, 4, 5,
1, 2, 3, 5, 6,
3, 4, 5, 6, 7,
1, 2, 3, 4, 5

add them all is 72

light yellow are
6, 7,
4, 7,
1, 2,
6, 7

add them all is 40

but... why???