Table:
0
A
B
C
1
document status code
document status description
reference document status
2
working
currently working on
3
done
mailed
4
overdue
mailed late

Questions and formulas:
Question: all document status codes.
Formula: UNIQUE(A1)
Formula2: UNIQUE(A2:A4)
Level: easy
Question: the document status codes.
Formula: UNIQUE(A1)
Formula2: UNIQUE(A2:A4)
Level: easy