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Hint 1
Have you cut out all the circles? Now check what they have in common. They say; ‘Find what is in common and it will connect.’
Hint 2
There is only 1 way that everything will be on the right place. Do you have two connecting circles that can be fit in multiple places? Then try to find others that connect to those two. A string of 3 or 4 might be more special and possibly special enough to be placed in only one spot.
Hint 3
Is everything on the right place? All is left is the equation. But how do these lettercombinations become numbers? Have you tried a special table? Not sure which table to check? Try rereading the title of the BrainBreaker.