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May I know which one is grammatical?

We use a LTS (labelled transition system) to describe the semantics of the system.

We use an LTS (labelled transition system) to describe the semantics of the system.

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  • [Related](http://ell.stackexchange.com/questions/6760/should-individual-letters-be-preceded-with-an/6765#6765): a or an before individual letters. – J.R. Jun 01 '14 at 10:45

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