Dinstein have two students, SK and Wisely. His birthday is M/D, where M is month and D is day. Disntein tell SK the M and he tell Wisely the D and he list out some date
4-March, 5-March, 8-March, 4-Jun, 7-Jun, 1-Sept, 5-Sept, 1-Dec, 2-Dec and 8-Dec
SK: if I dont know then Wisely also don't know.
Wisely: Initially I don't know, but now I know the answer.
SK: Then I also know the answer.
When is Dinstein birthday?