Table:
0
A
B
C
D
E
1
Class
Part 1
Part 2
Part 3
Part 4
2
7a
*haitaną
*hēt
*hētun
*haitanaz
3
7b
*hlaupaną
*hleup
*hleupun
*hlaupanaz
4
7c
*haldaną
*held
*heldun
*haldanaz
5
7d
*rādaną
*rēd
*rēdun
*rādanaz
6
7e
*blōtaną
*bleut (West), *blēt (North)
*bleutun (West), *blētun (North)
*blōtanaz

Questions and formulas:
Question: What was part 4 when part 3 was *hleupun?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="*hleupun"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="*hleupun"),5))
Level: medium
Question: What was the class when part 2 was *hēt?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="*hēt"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6="*hēt"),1))
Level: medium
Question: What was the class when part 4 was *rādanaz?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="*rādanaz"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="*rādanaz"),1))
Level: medium
Question: What was part 2 when part 4 was *blōtanaz?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="*blōtanaz"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="*blōtanaz"),3))
Level: medium
Question: What was part 2 when part 4 was *haldanaz?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="*haldanaz"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="*haldanaz"),3))
Level: medium
Question: What was the class when part 3 was *heldun?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="*heldun"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="*heldun"),1))
Level: medium