Table:
0
A
B
C
D
E
1
District
Vacator
Reason for change
Successor
Date successor seated
2
Louisiana 1st
Richard A. Tonry (D)
Forced to resign May 4, 1977
Bob Livingston (R)
August 27, 1977
3
New York 21st
Robert García (R-L)
Changed parties February 21, 1978
Robert García (D)
February 21, 1978
4
Tennessee 5th
Clifford Allen (D)
Died June 18, 1978
Vacant
Not filled this term
5
California 18th
William M. Ketchum (R)
Died June 24, 1978
Vacant
Not filled this term
6
Illinois 1st
Ralph Metcalfe (D)
Died October 10, 1978
Vacant
Not filled this term
7
Maryland 6th
Goodloe Byron (D)
Died October 11, 1978
Vacant
Not filled this term
8
Wisconsin 6th
William A. Steiger (R)
Died December 4, 1978
Vacant
Not filled this term
9
Wyoming At-large
Teno Roncalio (D)
Resigned December 30, 1978
Vacant
Not filled this term
10
California 3rd
John E. Moss (D)
Resigned December 31, 1978
Vacant
Not filled this term
11
California 14th
John J. McFall (D)
Resigned December 31, 1978
Vacant
Not filled this term
12
California 33rd
Del M. Clawson (R)
Resigned December 31, 1978
Vacant
Not filled this term
13
Kansas 5th
Joe Skubitz (R)
Resigned December 31, 1978
Vacant
Not filled this term
14
Michigan 10th
Elford A. Cederberg (R)
Resigned December 31, 1978
Vacant
Not filled this term
15
New Jersey 14th
Joseph A. LeFante (D)
Resigned December 31, 1978
Vacant
Not filled this term
16
New York 9th
James Delaney (D)
Resigned December 31, 1978
Vacant
Not filled this term
17
Texas 6th
Olin E. Teague (D)
Resigned December 31, 1978
Vacant
Not filled this term
18
Texas 11th
William R. Poage (D)
Resigned December 31, 1978
Vacant
Not filled this term

Questions and formulas:
Question: What is the name of the vacator for district Louisiana 1st?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Louisiana 1st"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E18,A2:A18="Louisiana 1st"),2))
Level: medium