Table:
0
A
B
C
D
E
1
Date
Name
Flag
Tonnage (GRT)
Sunk by
2
16 March 1943
Elin K
Norway
5,214
U-603
3
16/17 March 1943
Zaanland
Netherlands
6,513
U-758
4
16/17 March 1943
Southern Princess
United Kingdom
12,156
U-600
5
16/17 March 1943
Harry Luckenbach
United States
6,366
U-91
6
16/17 March 1943
Coracero
United Kingdom
7,252
U-384
7
16/17 March 1943
Terkoeli
Netherlands
5,158
U-631 , U-384 ?
8
17 March 1943
James Oglethorpe
United States
7,176
U-758 , U-91
9
17 March 1943
William Eustis
United States
7,196
U-435 , U-91
10
17 March 1943
Nariva
United Kingdom
8,714
U-600 , U-91
11
17 March 1943
Irenee du Pont
United States
6,125
U-600 , U-91
12
18 March 1943
William Q Gresham
United States
7,191
U-221
13
18 March 1943
Canadian Star
United Kingdom
8,293
U-221
14
19 March 1943
Matthew Luckenbach
United States
5,848
U-523 , U-527

Questions and formulas:
Question: What is the flag for Terkoeli?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="terkoeli"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,B2:B14="terkoeli"),3))
Level: medium
Question: What is the date for the flag of Norway?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="norway"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,C2:C14="norway"),1))
Level: medium
Question: Who sunk the ship with the flag of Norway?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="norway"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,C2:C14="norway"),5))
Level: medium