Columns A & B contain matching pairs of numbers and letters.
Each number in column A may appear multiple times, on each occasion with a different corresponding letter.
We want to search the data and retrieve the letter corresponding to the nth match of specified numbers from column A. Column C specifies the number to search for, and column D specifies the particular match required.
Use the INDEX, SMALL, IF, and ROW functions as shown in the following Array formula:
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