Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Result
Candidates
2
Texas 1
Wright Patman
Democratic
1928
Re-elected
Wright Patman (D) 94.7% Thomas A. Clarke (R) 5.3%
3
Texas 2
John C. Box
Democratic
1918
Lost renomination Democratic hold
Martin Dies, Jr. (D) Unopposed
4
Texas 3
Morgan G. Sanders
Democratic
1920
Re-elected
Morgan G. Sanders (D) Unopposed
5
Texas 4
Sam Rayburn
Democratic
1912
Re-elected
Sam Rayburn (D) 88.8% Floyd Harry (R) 11.2%
6
Texas 6
Luther A. Johnson
Democratic
1922
Re-elected
Luther A. Johnson (D) Unopposed
7
Texas 7
Clay Stone Briggs
Democratic
1918
Re-elected
Clay Stone Briggs (D) Unopposed
8
Texas 8
Daniel E. Garrett
Democratic
1920
Re-elected
Daniel E. Garrett (D) Unopposed
9
Texas 10
James P. Buchanan
Democratic
1912
Re-elected
James P. Buchanan (D) Unopposed
10
Texas 11
Oliver H. Cross
Democratic
1928
Re-elected
Oliver H. Cross (D) Unopposed
11
Texas 12
Fritz G. Lanham
Democratic
1919
Re-elected
Fritz G. Lanham (D) Unopposed
12
Texas 13
Guinn Williams
Democratic
1922
Re-elected
Guinn Williams (D) 91.1% W. C. Witcher (R) 8.9%
13
Texas 17
Thomas L. Blanton
Democratic
1930
Re-elected
Thomas L. Blanton (D) Unopposed

Questions and formulas:
Question: Name the number of incumbents for texas 12 
Formula: ROWS(UNIQUE(FILTER(B1, A1="Texas 12")))
Formula2: ROWS(UNIQUE(FILTER(B2:B13, A2:A13="Texas 12")))
Level: medium