I just looked up 'but' in the Cambridge dictionary. It gives the following sentence as an example where but is allegedly a preposition. ' However, when I type this sentence into the parsing VISL tree structure website, it says that - but - is a conjunction, which is exactly what I would've thought.
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Cup cakeDoes this mean that this website is only partially correct?It's not a human. The website probably has a rule, "But is a conjunction."