Oddly, but no - if you send dit-dah-dah-dit-dah-dit - it's a repeating rhythm - but dit-dah = A and dah = T would just be A T, which would work perfectly for me - but I guess like we have grammar pedants on the net, we have punctuation pedants on CW. For what it's worth, punctuation wasn't even in my test. I'd learnt the common ones, but the Post Office fella didn't send me any at all that I remember.
My most common one was ........ I used that very often.