1)All goods exchange is not refundable.
2)All goods for exchange are not refundable.
3)The exchange of any goods are not refundable.
4) Items once exchanged will not be taken back or replaced.
5)Items once exchanged will not be taken back for replacement.
Are all sentences above correct? Which one is more formal. Thank you.
What do you mean by "exchange" in your sentences? Can you give us an example?
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What do you mean by "exchange" in your sentences? Can you give us an example?