Semi Colon or Em Dash?
When it comes to separating thoughts and clauses, this tends to be quite a complex distinction to make. Especially when you involve colons and commas as well. Oh, the joys of the English language! For the most part, a semi colon and an em dash are interchangeable — used to separate an afterthought (much like this one).
Just in case you wanted to know the full story, here is a more in-depth breakdown of each:
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