Table:
0
A
B
C
D
E
1
Name
Class
Hometown
Boarded
Position
2
Andrews, Mr. Thomas
First
Belfast , Ireland
Belfast
Shipbuilder
3
Campbell, Mr. William Henry
Second
Belfast , Ireland
Belfast
Joiner
4
Chisholm, Mr. Roderick Robert Crispin
First
Belfast , Ireland
Belfast
Draughtsman
5
Cunningham, Mr. Alfred Fleming
Second
Belfast , Ireland
Belfast
Fitter
6
Frost, Mr. Anthony Wood "Artie"
Second
Belfast , Ireland
Belfast
Fitter
7
Knight, Mr. Robert J.
Second
Belfast , Ireland
Belfast
Fitter
8
Parkes, Mr. Francis "Frank"
Second
Belfast , Ireland
Belfast
Plumber
9
Parr, Mr. William Henry Marsh
First
Belfast , Ireland
Belfast
Electrician
10
Watson, Mr. Ennis Hastings
Second
Belfast , Ireland
Belfast
Electrician's Apprentice

Questions and formulas:
Question: Who boarded first class?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="first"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,B2:B10="first"),4))
Level: medium