I've got the following series of data (maximum of 4 data fields per group)

Cells A1:A4

White
Red
White
Blue

I want to produce a list in another column to pull those values minus
duplicates. This is something that I want to automatically calculate. The
text values in Cells A1:A4 are subject to change and are not constant, so, I
would want to automatically remove those duplicate values, and if there's a
change in A1:A4, it'll automatically update in B1:B4.

So my column should read

Cells B1:B3

White
Red
Blue

Does this involve an INDEX formula or what formula do I use to accomplish
this? Thanks!