Table:
0
A
B
C
D
E
1
claim stage id
next claim stage id
claim status name
claim status description
claims processing stages
2
1
1
Open
Open a new claim
3
3
1
Close
Close a claim

Questions and formulas:
Question: Open status claims
Formula: FILTER(A1:E1, C1="open")
Formula2: FILTER(A2:E3, C2:C3="open")
Level: easy
Question: Do any processing claims have open status?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="open"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E3,C2:C3="open"),5))
Level: medium
Question: How many stages in processing claims? 
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E3))
Level: easy
Question: The open status in claims processing,
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="open"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E3,C2:C3="open"),5))
Level: medium
Question: Any open status in claims processing?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="open"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E3,C2:C3="open"),5))
Level: medium
Question: Number of stages during claims processing
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E3))
Level: easy
Question: How many stages in processing claims?
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E3))
Level: easy