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Oh so that's what its for rule
(lemmy.ml)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
They separate different clauses that don't necessarily have to be two separate sentences. It can be used in place of a comma where you would follow with but, and, or, nor, for, so and yet.
I have a shirt, but it is itchy.
I have a shirt; it is itchy.