How about changing the problem such that the centre value is not doubled?
Test for balanced parentheses
2 b | ~ 2 b
Multiply a column by a row
Find a Pythagorean triple
Test Problem; Create a 5x5 array containing all ones
BULLSEYE Part 2: Reference Problem 18 BULLSEYE
Make combination of two given matrices.
ZigZag matrix with reflected format
~~~~~~~ WAVE ~~~~~~~~~
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