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 Hint
There are several ways you could start working on this problem. Here
is one way.
Look for doubles among the numbers in the box. These are choices
for the dots at the beginning and end of a 2x arrow.
117 and 234
78 and 156
Try one of these choices for the first 2x arrow. Notice that if
you make the first choice, you will then need to subtract 27 from
234. The end of the -27 arrow would be 207, and that number is not
available. So you must choose 78 and 156 for the first 2x arrow.
Back to Nabu's Knee-knocker
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