Table:
0
A
B
C
D
E
1
Model
Seats
Period
Built
Country
2
Saab 90 Scandia
24-32
1946-1954
18
Sweden
3
Aérospatiale N 262
23-29
1962-1976
110
France
4
Short SC.7 Skyvan
19
1963–1986
153
United Kingdom
5
De Havilland Canada DHC-6 Twin Otter
19
1965–1988, 2008–present
846
Canada
6
Embraer EMB 110 Bandeirante
18-21
1968–1990
500
Brazil
7
Handley Page Jetstream
16
1969-1993
66
United Kingdom
8
Let L-410 Turbolet
19
1971-present
1,138
Czech Republic
9
Short 330
30
1974–1992
125
United Kingdom
10
CASA C-212 Aviocar
26
1974–present
578
Spain
11
Antonov An-28 / PZL M28
18
1975-1993 / 1993-2006
191 / 39
Ukraine / Poland
12
BAe Jetstream
18
1980-1993
386
United Kingdom
13
Short 360
36-39
1981–1991
165
United Kingdom
14
Saab 340 , pressurized
37
1983-1999
459
Sweden
15
Embraer EMB 120 Brasilia , pressurized
30
1983–2001
354
Brazil
16
Cessna 208
14
1984-present
2,000+
United States
17
Harbin Y-12
17
1985-present
105
People's Republic of China
18
BAe Jetstream 41 , pressurized
29
1992–1997
100
United Kingdom
19
Dornier 328 , pressurized
30
1992-2005
217
Germany
20
Saab 2000 , pressurized
50-58
1994-1999
64
Sweden

Questions and formulas:
Question: In what time period were 578 built?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=578),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E20,D2:D20=578),3))
Level: medium
Question: In what time period was the Cessna 208 built?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="cessna 208"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E20,A2:A20="cessna 208"),3))
Level: medium
Question: In what time period were 354 built?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=354),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E20,D2:D20=354),3))
Level: medium