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Formula to Count Duplicate entries in Data Range

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    Formula to Count Duplicate entries in Data Range

    Hi,

    I have the following list of data and want to use a formula to ensure there is only 1 of every code.

    The only formula i can think of is =countif(A:A,A1) and repeat this for each line.

    Is there a way to consolidate it into 1 formula?
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