In these situations, defensive copying of the entire object rather than the reference is usually an easy but costly solution.

The obvious, though costly, solution to the problems of working single lines would be to double the tracks.

Why, then, make the inherently costly solution to greenhouse warming even costlier?

Only the president has the clout to engineer a true, less costly solution in the days remaining before Congress's summer recess.

A costly solution (used only on pipes) is drip irrigation.

It's the least costly, and least accurate, solution to the problem.

Others suggest that the problems are intractable, with the proposed solutions too costly.

The reservoir, he said, was a costly but proper solution.

Neither the problems nor the same costly solutions ever seem to go away, despite all the concern, the debates and the strategies.

As for the technical discrepancy and the different equipment required, it should be pointed out that this is the least costly solution.