Although a valid solution, it also stretched out the flight time.
This assumption will be valid for all but very concentrated solutions.
Such an action is a valid solution to a problem.
Obviously, it's not for everyone but it is quite a valid solution for many.
The only valid solution: national health care with guaranteed universal coverage.
It can be shown that for any instance of the problem, there is at least one valid solution.
A constraint is a condition which must be met by any valid solution to a problem.
Withholding tax is, in my opinion, just as valid a solution.
This can make clear that there are many valid solutions to one particular problem.
I do not think that this is a valid solution.