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How should I punctuate the following sentece with the given logical structure when I want to use conjuction "if" only one time and a conjuction "and" to seperate the conditions?

Logical structure: [Statement] is true if [Condition #1] and [Condition #2] is true.

"This method is implemented if it's impossible to verify the results of the process, and the shorcomings may not be revealed until the product is used."

Should a comma be between "process" & "and"?

And what if I use a conjuction "or" (with OR logical relation) instead of "and"? How would the presence or lack of a comma would affect the sentence grammarly and logically?

"This method is implemented if it's impossible to verify the results of the process, or the shorcomings may not be revealed until the product is used."

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"This method is implemented if it's impossible to verify the results of the process , and the shortcomings may not be revealed until the product is used."

For clarity, an easier-to-read version would be:

"This method is implemented [or used] if verification of process results is impossible and if shortcomings are not revealed until the product is used."

It's best to use subject-verb-predicate in English. In my version, this structure is used even after the If clause with a compound phrases. I suggest two IFs to make sure it is read as two conditions and not a "compound" condition.

This X is Y if A is B or if C is D.

This X is Y if A is B and if C is D.

This X is Y if A is B and C is D.

Conclusion: There is no comma in these sentences.

  • You know what is very distressing? To answer a question, then have the OP repeat his/her same question again. – Lambie Sep 4 '18 at 12:49
  • No comma. How many times do you want me to repeat it? – Lambie Sep 4 '18 at 13:19

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