I'm curious how many period characters can be in a row in a valid sentence.
I acknowledge that there are different conventions for how to treat dots (e.g. treating an ellipsis as a single character or putting a space before and after an ellipsis), but for the purposes of this question, I think we should allow reasonable conventions that could be considered acceptable, even if they aren't perhaps recommended. I'm also fine ignoring whitespace.
Examples
- Here's a sentence with one period.
- This sentence combines two periods into one, according to some prof.
- This sentence ends with an ellipsis....
- This sentence also might make sense, according to Knowsalot et al.....
Clarification
Please read the question carefully and in its entirety before voting to close a question.
Some closed this question because they thought this question has an answer here: When "etc." is at the end of a phrase, do you place a period after it?. Those people have made unreasonable assumptions about what this question is asking.
For clarity: I am not asking whether or not the period following an abbreviation gets put at the end of a phrase. I am not asking about a period before or after an ellipsis. I am asking how many periods can be in a row for any reason. Clearly, those other questions are relevant to my question, but to answer my question, you'd need the answers to all of those kinds of questions and combine their answers to be able to answer this question.