'Returning each text element just once from a selected range of cells

I'm making a google sheet file to track some of my expenses. I need to return an array starting from a column, that takes each text element from another column just once. For example, i want to take each element from column A and return an array starting from C1 that takes all elements from A just once. What's the formula for doing this?

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Solution 1:[1]

use this formula:

=UNIQUE(A1:A)

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