It doesn't sound like a charrting question, but in your worksheet (having
selected your 128*128 range & with cell A1 active), use Format/ Conditional
Formatting/ Formula Is:
=COUNTIF($A$1:$DX$128,A1)<>1
and select a format to mark your duplicates.
But if you're wanting to do the same for each row in turn you'll need to
make the row reference relative, not absolute:
=COUNTIF($A1:$DX1,A1)<>1
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