Spanish translation: por riguroso orden de solicitud (or llegada)
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Explanation: On a first come first serve basis. Come-first is a different thing. Here you need to know that we have: |On a| first come| first serve| basis|
Meaning: the first ones will be served first, the second ones secondly, the third ones thirdly etc., implying an orderly conduct.
I hope the explanation helps, a little!
Camaxilo Local time: 03:29 Native speaker of: Portuguese