Table:
0
A
B
C
D
E
1
Animal
Proto-Austronesian
Proto-Malayo-Polynesian
Proto-Oceanic
Proto-Polynesian
2
dog
*asu
*asu
–
–
3
bird
*qayam
*qayam, *manuk
*manuk
*manu
4
snake
*SulaR
*hulaR, *nipay
*mwata
*ŋata
5
louse
*kuCu
*kutu
*kutu
*kutu
6
fish
*Sikan
*hikan
*ikan
*ika

Questions and formulas:
Question: What proto-oceanic has louse as the animal?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="louse"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="louse"),4))
Level: medium