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I found a sentence in a paper which I believe to be wrong, I have a couple of questions:

Is it wrong? If not, which one is the correct form?

The sentence:

... these algorithms require successive control messages exchanges between MB and GA ...

The part that I have emphasized confuses me.

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    The author probably intended "messages exchanged" (I.e. the final s was a typo for d, which is adjacent on a QWERTY keyboard), or "message exchanges" (singular "message").
    – Dan Bron
    Aug 28, 2014 at 16:36
  • "require successive control-message-exchanges between" OR "require successive control messages, to be exchanged between"
    – Fattie
    Aug 28, 2014 at 16:37
  • @Joe Are the -es needed?
    – Tim
    Aug 28, 2014 at 18:22

1 Answer 1

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these algorithms require successive control messages exchanges between MB and GA

Should be

these algorithms require successive control message exchanges between MB and GA

See the removal of the "s" from "messages".

This is because the "exchanges" is plural. If it was instead

these algorithms require successive control messages between MB and GA

without the "exchanges", then it would be fine, but not both.

In fact you could equally have

these algorithms require successive control exchanges between MB and GA

although that is less explicit that we are referring to messages.

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    Also control messages (to be) exchanged between would be acceptable
    – Barmar
    Aug 28, 2014 at 18:04

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