Table:
0
A
B
C
D
E
1
17th c.
American
British
Australian
Examples
2
ɐ
ə
ə
ə
amœba, anemone, ascesis
3
e
i, ɪ, ə
i, ɪ, ə
i, ɪ, ə
Elysium, emeritus, epitome, erotica
4
e
i, ɪ, ə
i, ɪ, ə
i, ɪ, ə
ænigma
5
e
i, ɪ, ə
i, ɪ, ə
i, ɪ, ə
œsophagus
6
ɛi
ai
aɪ
ɑe
idea
7
ɛi
ai
aɪ
ɑe
hyperbola, hypothesis
8
o
ɞu, ɞ, ə
əʊ, ə
əʉ, ə
Olympus

Questions and formulas:
Question: What is 17th c., when American is "ə"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="ə"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,B2:B8="ə"),1))
Level: medium
Question: What is British, when 17th c. is "ɛi"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="ɛi"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,A2:A8="ɛi"),3))
Level: medium
Question: What is 17th c., when Australian is "i, ɪ, ə", and when Examples is "œsophagus"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="i, ɪ, ə")*(E1="œsophagus")),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,(D2:D8="i, ɪ, ə")*(E2:E8="œsophagus")),1))
Level: medium
Question: What is Australian, when Examples is "amœba, anemone, ascesis"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="amœba, anemone, ascesis"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,E2:E8="amœba, anemone, ascesis"),4))
Level: medium
Question: What is British, when Australian is "i, ɪ, ə", and when Examples is "œsophagus"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="i, ɪ, ə")*(E1="œsophagus")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,(D2:D8="i, ɪ, ə")*(E2:E8="œsophagus")),3))
Level: medium
Question: What is Australian, when Examples is "elysium, emeritus, epitome, erotica"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="elysium, emeritus, epitome, erotica"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,E2:E8="elysium, emeritus, epitome, erotica"),4))
Level: medium