I do not know if a solution exists, but we can hope.

But it seems like you felt a complete solution did not exist.

A solution using a smaller amount of time cannot exist.

That's why, like 25 years ago, a military solution to this problem doesn't exist.

Currently, no clear solution exists to deal with these activities.

The decision problem then is to decide whether such a solution exists or not.

A military solution does not exist, and will risk the stability of the entire country.

If a solution existed, it certainly was not apparent to him.

If a solution to the problem existed, surely someone would have found it.

If this is only partially so, the solution does not exist.