well, here we go, ChatGPT in GPT-4 mode:

There are 7 instances of the letter 'e' in the sentence: "Try asking chatGPT to count how many e's are in a sentence."

another one:

The words with the letter 'e' from the sentence "Try asking chatGPT to count how many e's are in a sentence" are:

    asking
    sentence

and another, notice the last one:

Here are some English words containing three instances of the letter 'e':

    Nevertheless
    Extreme
    Relevance
    Precedence
    Residence
    Easement
    Demeanor

Please note that this is not an exhaustive list, but these examples should give you an idea of words with three 'e's in them.

What surprising here is that it's still capable of writing hundred lines of python code..