Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Result
Candidates
2
Pennsylvania 4
Herman Toll
Democratic
1958
Re-elected
Herman Toll (D) 64.1% James R. Cavanaugh (R) 35.9%
3
Pennsylvania 7
William H. Milliken, Jr.
Republican
1958
Retired Republican hold
George Watkins (R) 51.1% Leonard Bachman (D) 48.9%
4
Pennsylvania 9
Paul B. Dague
Republican
1946
Re-elected
Paul B. Dague (R) 57.7% John A. O'Brien (D) 42.3%
5
Pennsylvania 20
Elmer J. Holland
Democratic
1956
Re-elected
Elmer J. Holland (D) 74.4% Ronald Bryan (R) 25.6%
6
Pennsylvania 23
Albert W. Johnson
Republican
1963
Re-elected
Albert W. Johnson (R) 54.9% John Still (D) 45.1%
7
Pennsylvania 25
Frank M. Clark
Democratic
1954
Re-elected
Frank M. Clark (D) 70.3% John Loth (R) 29.7%

Questions and formulas:
Question: What district is incumbent albert w. johnson from?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Albert W. Johnson"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F7,B2:B7="Albert W. Johnson"),1))
Level: medium
Question: How many times was frank m. clark the incumbent?
Formula: ROWS(UNIQUE(FILTER(E1, B1="Frank M. Clark")))
Formula2: ROWS(UNIQUE(FILTER(E2:E7, B2:B7="Frank M. Clark")))
Level: medium
Question: What district is incumbent elmer j. holland from?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Elmer J. Holland"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F7,B2:B7="Elmer J. Holland"),1))
Level: medium