Table:
0
A
B
C
D
E
F
1
Round
Clubs remaining
Clubs involved
Winners from previous round
New entries this round
Leagues entering at this round
2
Extra Preliminary Round
762
406
none
406
Levels 9 and 10 in football league pyramid
3
Second Round Qualifying
276
160
116
44
Conference North Conference South
4
Third Round Qualifying
196
80
80
none
none
5
Fourth Round Qualifying
156
64
40
24
Conference National
6
First Round Proper
124
80
32
48
Football League One Football League Two
7
Second Round Proper
84
40
40
none
none
8
Third Round Proper
64
64
20
44
Premier League Football League Championship
9
Fourth Round Proper
32
32
32
none
none
10
Fifth Round Proper
16
16
16
none
none
11
Sixth Round Proper
8
8
8
none
none
12
Semi-Finals
4
4
4
none
none

Questions and formulas:
Question: Which leagues entered in rounds where there were 16 winners from the previous round?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1=16),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,D2:D12=16),6))
Level: medium
Question: Which rounds had 32 clubs involved?
Formula: LET(query1,SUMMARIZE(A1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)=32))
Formula2: LET(query1,SUMMARIZE(A2:A12,SUMX(C2:C12)),FILTER(query1,CHOOSECOLS(query1,2)=32))
Level: hard
Question: Which round had 24 new entries?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1=24),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,E2:E12=24),1))
Level: medium
Question: Which leagues entered an extra preliminary round?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="Extra Preliminary Round"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,A2:A12="Extra Preliminary Round"),6))
Level: medium