In the "N1 Diagnostic Centre" which one is correct: "number one" or "number first"?

or:In the "N1 Diagnostic Centre" which one is correct: "number one" or "number first"?or:\"Number one\" is correct.

or:In the "N1 Diagnostic Centre" which one is correct: "number one" or "number first"?


or:\"Number one\" is correct.

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