Table:
0
A
B
C
D
E
F
1
Episode
Theme
Song choice
Original artist
Order #
Result
2
Audition
N/A
" Slow Dancing in a Burning Room "
John Mayer
N/A
Advanced
3
Hollywood
First Solo
" I Don't Need No Doctor "
Ray Charles
N/A
Advanced
4
Hollywood
Group Round
" Closer "
Ne-Yo
N/A
Advanced
5
Hollywood
Second Solo
" Bubbly "
Colbie Caillat
N/A
Advanced
6
Top 24 (12 Men)
Billboard Hot 100 Hits
" Heaven "
Bryan Adams
11
Safe
7
Top 20 (10 Men)
Billboard Hot 100 Hits
" I Don't Want to Be "
Gavin DeGraw
3
Safe
8
Top 16 (8 Men)
Billboard Hot 100 Hits
" You'll Think of Me "
Keith Urban
5
Safe
9
Top 12
The Rolling Stones
" It's All Over Now "
The Valentinos
3
Safe
10
Top 11
Billboard Number 1 Hits
" The Power of Love "
Huey Lewis and the News
9
Safe
11
Top 10
R&B / Soul
" Hold On, I'm Comin' "
Sam & Dave
2
Safe
12
Top 9
Lennon–McCartney
" Jealous Guy "
John Lennon
7
Safe
13
Top 9
Elvis Presley
" Lawdy Miss Clawdy "
Lloyd Price
9
Safe
14
Top 7
Inspirational
" Don't Stop "
Fleetwood Mac
1
Bottom 3
15
Top 6
Shania Twain
" Don't! "
Shania Twain
3
Bottom 3
16
Top 5
Frank Sinatra
" Blue Skies "
Belle Baker
2
Safe
17
Top 4
Songs of the Cinema
Solo " Mrs. Robinson " — The Graduate
Simon & Garfunkel
4
Safe
18
Top 3
Contestant's Choice
" OK, It's Alright with Me "
Eric Hutchinson
1
Eliminated

Questions and formulas:
Question: Which episode is #4?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1=4),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F18,E2:E18=4),1))
Level: medium