Table:
0
A
B
C
D
E
F
G
1
Region
Group A
Group B
Group C
Group D
Group E
Group F
2
1
Maine New Hampshire Vermont
Massachusetts
Connecticut Rhode Island
Delaware New Jersey
New York
Pennsylvania
3
2
Maryland
West Virginia
Missouri
Indiana
Kentucky
Tennessee
4
3
Ohio
Illinois
Michigan
Wisconsin
Iowa
Minnesota
5
4
Texas
Louisiana
Arkansas Oklahoma
Colorado
Kansas Nebraska
Arizona New Mexico
6
5
Virginia
North Carolina
South Carolina
Florida
Georgia
Mississippi Alabama

Questions and formulas:
Question: Who is in group a when indiana is in group d?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="Indiana"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,E2:E6="Indiana"),2))
Level: medium
Question: Who is in group a when indiana is in group d?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="Indiana"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,E2:E6="Indiana"),2))
Level: medium
Question: Who is in group c when wisconsin is in group d?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="Wisconsin"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,E2:E6="Wisconsin"),4))
Level: medium
Question: Who is in group c when iowa is in group e?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,F1="Iowa"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,F2:F6="Iowa"),4))
Level: medium