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Doubt about genitive form

• We're doing a research work and we're currently analysing two different systems of speakers living in the 14th century's London.

• We have a doubt regarding the genitive form.

• Would it be more correct to say: "System 1's speakers" or "System 1 speakers" "System 1's pronunciation" or "System 1 pronunciation" We're not sure if it's a genitive form or an apposition. Thanks!