Table:
0
A
B
C
D
E
1
Region name
State name
Region #
Page count
Regional Page #
2
Pacific Northwest
OR/WA
1
6
5-6, 9-10, 13-14
3
Mountain
ID/MT/WY
2
9
5-7, 9-11, 13-15
4
North Central
IA/KS/MN/MO/NE/ND/SD
3
12
1-3, 5-7, 9-11, 13-15
5
Great Lakes
IL/IN/KY/MI/OH/WI
4
9
1-2, 5-6, 9-11, 13-14
6
Northeast
CT/DE/MA/MD/ME/NH/NJ/NY/PA/RI/VA/VT/WV
5
9
3, 5-7, 9-11, 13-14
7
Pacific Southwest
CA/NV
6
6
5-6, 9-10, 13-14
8
Four Corners
AZ/CO/NM/UT
7
10
1, 5-7, 9-11, 13-15
9
South Central
AR/LA/OK/TX
8
13
1-12, 14

Questions and formulas:
Question: In the North Central region, what are the regional page #'s?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="North Central"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="North Central"),5))
Level: medium
Question: What states have a regional page # of 1, 5-7, 9-11, 13-15?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="1, 5-7, 9-11, 13-15"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,E2:E9="1, 5-7, 9-11, 13-15"),2))
Level: medium
Question: Which region has a regional page # of 1-3, 5-7, 9-11, 13-15?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="1-3, 5-7, 9-11, 13-15"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,E2:E9="1-3, 5-7, 9-11, 13-15"),1))
Level: medium
Question: In Ca/Nv, what are all of the regional page #s?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="CA/NV"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,B2:B9="CA/NV"),5))
Level: medium