xxx: 16.10.11
with Birthday)

yyy: 16.10.11
thank you 😉

xxx: 16.10.12
with Birthday)

yyy: 17.10.12
What a busy letter...
In this case, thank you)

xxx: 16.10.13
Happy Birthday to you :)

yyy: 16.10.13
The trend continues)
thank you )