Table:
0
A
B
C
D
E
F
G
1
DVD Name
Ep #
Region 1
Region 2 (Scandinavia)
Region 2 (UK)
Region 4
Special features
2
The Fourth Season
34
April 15, 2008
March 11, 2009
March 22, 2010
April 2, 2009
None
3
The Fifth Season (Volume One)
19
February 10, 2009
N/A
N/A
N/A
None
4
The Fifth Season (Volume Two)
15
November 24, 2009
N/A
N/A
N/A
None
5
The Complete Fifth Season
34
N/A
March 24, 2010
June 21, 2010
April 1, 2010
None
6
The Sixth Season (Volume One)
13
May 3, 2011
N/A
N/A
N/A
None
7
The Sixth Season (Volume Two)
14
July 19, 2011
N/A
N/A
N/A
None
8
The Seventh Season (Volume One)
18
July 31, 2012
N/A
N/A
N/A
None

Questions and formulas:
Question: Name the region 1 where region 4 for april 2, 2009
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,F1="April 2, 2009"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G8,F2:F8="April 2, 2009"),3))
Level: medium
Question: Name the region 1 for episode number 13
Formula: LET(query1,SUMMARIZE(C1,SUMX(B1)),FILTER(query1,CHOOSECOLS(query1,2)=13))
Formula2: LET(query1,SUMMARIZE(C2:C8,SUMX(B2:B8)),FILTER(query1,CHOOSECOLS(query1,2)=13))
Level: hard