Take values in the top left and centre circles and put their sum in correspond- ing segments of the lower left circle. Take values in the middle and right hand circles, and put their difference into corresponding segments of the lower right circle.
Add up numbers in corresponding segments of each square. The sum of the digits in the left hand segments equals 20, the sum of the upper segments equals 22, the right hand segments equals 24 and the lower segments equal 26.
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