I have always interpreted logic to mean a systematic form (premise-reason-conclusion) of reason. So it seems that you are saying one word (reason) and a branch of that word (logic). But the "and" suggest they are two separate things. If my understanding if these two word are correct, it would be like saying "science and biology". As biology is a branch of science. Is logic considered a branch word of reason? Or are these two separate words?
Learn English – Is the phrase “logic and reason” grammatically correct
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Reason does not need to be logical (one can argue that reasoning is):
Reason is basically answering the question why. It implies rationality.
Logic is a systematic approach to a problem.
To me, logic is the way one arrives at an answer.
Pre-Socratic philosophers did not appear to follow any logical principles; reason was descriptive rather than prescriptive, a way to understand how people actually think rather than how they ought to think.
This may be a 'semantic unit' handed down to us by philosophers. However, I don't think it's necessarily tautological, as you seem to imply.