'SQL how to select distinct several columns

lets say there are several columns (c1, c2, c3, c4) It's okay for each column to be appeared several times, but I want to select all the columns with several columns distinct.

I want SELECT c1, DISTINCT(c2, c3), c4 something like this but it doesnt work, and GROUP BY doesnt work as well.

somebody help me please

sqlpostgresql


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