What happens twice in a week, and once in a year, but never in a day?!

Question: What happens twice in a week, and once in a year, but never in a day!?
Answers:

The appearance of the letter "e"!.Www@Enter-QA@Com

the letter "e"!.!.!.!. I'm just guessin'!!Www@Enter-QA@Com

easy :\ go act smart on some ppl else :PWww@Enter-QA@Com

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