The sentence that uses a semicolon incorrectly is there are two travel teams this year; the a team; the b team
A semicolon is used to join two related but independent clauses at the place of a comma and a coordinating conjunction. The coordinating conjunctions are- and, but, so, or, yet.
The sentence there are two travel teams this year; the a team; the b team.
The first semicolon in the sentence is misplaced here. It does not make a sense to use it here as there is no need for a comma or a coordinating junction.
Thus, the semicolon is used incorrectly here.
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