The phrase "a good and valid" is correct and usable in written English.
It can be used to describe something that is both acceptable and justifiable, often in the context of arguments, reasons, or points being made.
Example: "Her argument was a good and valid point in the discussion about climate change."
Alternatives: "a sound and reasonable" or "a strong and justifiable".
The supplier hereby declares that the receipt of monies by the said agent shall be a good and valid discharge of GNM's payment liabilities.
Senior research scientist Kenneth Geers from Comodo added: "Yahoo is a strategic player on the world wide web, which makes it a good – and valid – target for nation-state intelligence collection".
"But Chris," you say, "the protesters want to have this negative connotation -- that's why they chose the term in the first place!" Which is a good and valid point, I have to admit.
In previous studies accelerometry has been shown to be a good and valid method here [ 7].
SRH has been suggested to be a good and valid measure of health [ 82, 83], particularly in early adulthood when clinical endpoints are uncommon [ 48].
Such an analysis is a good and valid alternative if cause-specific death is not available and can sometimes even be more accurate than estimating cause-specific survival by using death certificates because the primary cause of death is often not clear and inter-doctor variation in the cause of death ascertainment is common.
A very good and valid message.
She supports him for a variety of good and valid political reasons and can overlook his economic rhetoric because she has confidence in his economic advising team, primarily Austan Goolsbee.Full disclosure: I was a student of Glenn Hubbard.
In forward direction, satellites can first be tracked when their elevation rises beyond 10°, even though a small delay will be experienced before good and valid data are acquired.
All good and valid reasons from people of an 'ambisextrous' nature (ZING).
Near the end of the trial last year, Judge McAvoy told the jury, "The F.B.I. had certain suspicions, good and valid suspicions, for looking into Mr. Aref, but why they did that is not to be any concern of yours".
