Table:
0
A
B
C
D
E
1
Name/ designation
Year of intro
Country of origin
Primary cartridge
Major users
2
CSMG
2000
Belgium
9x19mm Parabellum 22mm Grenade
n/a
3
Flieger-Doppelpistole 1919
1919
Switzerland
7.65x21mm Parabellum
n/a
4
Gordon Close-Support Weapon System
1972
Australia
9x19mm Parabellum
n/a
5
ITM Model 4
1990
United States
9x19mm Parabellum
n/a
6
Neal submachine gun
1948
United States
.22LR
n/a
7
Onorati SMG
1935
Italy
9x19mm Parabellum
n/a
8
Saturn machine pistol
1985
Colombia
.22LR
n/a
9
SerLea
1990
Lebanon
9x19mm Parabellum
n/a

Questions and formulas:
Question: Who are all the major users of the Gordon Close-Support Weapon System?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Gordon Close-Support Weapon System"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="Gordon Close-Support Weapon System"),5))
Level: medium
Question: What country made the Flieger-Doppelpistole 1919?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Flieger-Doppelpistole 1919"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="Flieger-Doppelpistole 1919"),3))
Level: medium
Question: How many years of introduction does the Neal Submachine Gun have?
Formula: ROWS(UNIQUE(FILTER(B1, A1="Neal submachine gun")))
Formula2: ROWS(UNIQUE(FILTER(B2:B9, A2:A9="Neal submachine gun")))
Level: medium
Question: Who are the major users from Australia?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="Australia"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,C2:C9="Australia"),5))
Level: medium
Question: Who are all the major users of the Saturn Machine Pistol?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Saturn machine pistol"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="Saturn machine pistol"),5))
Level: medium