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Discover Ludwig"only done once" is correct and usable in written English and it can be used to indicate that the action being discussed is unique, or happened a single time in the past.
For example, "The extra credit assignments can only be done once, so make sure you give it your all."
Exact(13)
Unlike in the theatre, a film scene is only done once.
"Then they started chanting Eddy's name, which I think they might have only done once since he's been here.
If these studies were only done once in one place and nobody could replicate them, I would not be including them in a list of harm caused by this chemical.
For F-OFDM, it is assumed that the transmit filtering and addition of the CP could be combined such that the filtering is only done once for the CP samples [24].
When comparing RZF and TPE precoding, we note that the complexity of precomputing the RZF precoding matrix is very large, but it is only done once per coherence period.
Congressional redistricting is only done once each decade, so control over the process has enduring consequences.
Similar(47)
Something you hope you will only do once.
"What concerns me the most is that this is the kind of experiment we can only do once," Rignot said.
"Some of those services you can only do once you're actually here and have an identifiable address.
But you know, buying a home is an event that most people will only do once every decade or so.
Apple also offered us a fleeting glimpse of the most popular apps ever, something the company only did once before.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com