[Question] How do I work with a column with multiple mode?

For example, a column records each of [0,1,2,3] for 3000 counts and records [4,5,6] for (199,299,399) counts. How should I get a list of mode numbers like [0,1,2,3]? It only returns 0 when I run clolumn.mode() in this case.

Thanks in advance!