I just did a quick math there is around 27000 invitation send out
Confirmation begin with Count
A 976
A 609
B 1013
B 664
C 1026
C 644
D 1021
D 620
E 998
E 641
F 1048
F 602
0 1015
0 593
1 1061
1 602
2 1040
2 659
3 1060
3 628
4 979
4 625
5 1051
5 635
6 1074
6 629
7 1044
7 599
8 995
8 607
9 927
9 927
Total 26612
I calculated that too and i hoped they didnt make any mistake as they were suppose to send 20000.