Table:
0
A
B
C
D
E
1
Class
Part 1
Part 2
Part 3
Part 4
2
1
ríða
reið
riðu
riðinn
3
2a
lúka
lauk
luku
lokinn
4
2b
frjósa
fraus
frusu
frosinn
5
3a
binda
batt
bundu
bundinn
6
3b
verða
varð
urðu
orðinn
7
4
bera
bar
báru
borinn
8
5
lesa
las
lásu
lesinn
9
6
ala
ól
ólu
alinn
10
7a
heita
hét
hétu
heitinn
11
7b
hlaupa
hljóp
hljópu
hlaupinn
12
7c
halda
helt
heldu
haldinn
13
7d
ráða
réð
réðu
ráðinn
14
7e
blóta
blét
blétu
blótinn

Questions and formulas:
Question: What is Part 1, when Part 2 is "fraus"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="fraus"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,C2:C14="fraus"),2))
Level: medium
Question: What is Part 3, when Part 1 is "frjósa"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="frjósa"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,B2:B14="frjósa"),4))
Level: medium
Question: What is Class, when Part 2 is "blétu"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="blétu"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,D2:D14="blétu"),1))
Level: medium
Question: What is Part 4, when Part 2 is "hljóp"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="hljóp"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,C2:C14="hljóp"),5))
Level: medium
Question: What is Part 4, when Part 2 is "batt"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="batt"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,C2:C14="batt"),5))
Level: medium
Question: What is Part 1, when Part 3 is "heldu"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="heldu"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E14,D2:D14="heldu"),2))
Level: medium