A).So here (4,3) it should be 1 and at (5,10) it should be 1 then it will give you the correct 2D even parity code
and there is another positions instead of correcting the above two positions, B). correction can be done at (5,3) it should be 1 and at (4,10) it should be 1.
[ NOTE : choose one either A or B ]
by mistakenly commented copied into an answer by me ...sorry