Table:
0
A
B
C
D
E
F
1
Name
Pennant
Builder
Laid Down
Launched
Commissioned
2
Chaplet
R52
Thornycroft , Woolston
29 April 1943
18 July 1944
24 August 1945
3
Charity
R29
Thornycroft, Woolston
9 July 1943
30 November 1944
19 November 1945
4
Chequers *
R61
Scotts, Greenock
4 May 1943
30 October 1944
28 September 1945
5
Chieftain
R36
Scotts, Greenock
27 June 1943
26 February 1945
7 March 1946
6
Chevron
R51
Alex. Stephen , Linthouse
18 March 1943
23 February 1944
23 August 1945
7
Cheviot
R90
Alex. Stephen, Linthouse
27 April 1943
2 May 1944
11 December 1945
8
Childers *
R91
Denny , Dumbarton
27 November 1943
27 February 1945
19 December 1945
9
Chivalrous
R21
Denny, Dumbarton
27 November 1943
22 June 1945
13 May 1946

Questions and formulas:
Question: What is the building for the r90 pennant?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="r90"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,B2:B9="r90"),3))
Level: medium
Question: What is the pennant with Denny, Dumbarton as the builder?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="denny, dumbarton"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,C2:C9="denny, dumbarton"),2))
Level: medium
Question: What is the laid down date of the destroyer with a r29 pennant?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="r29"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,B2:B9="r29"),4))
Level: medium