unyielded in a sentence

1. and is valid for all regions, both yielded and unyielded.
2. For general flow fields, it is necessary to develop numerical techniques to track down yielded / unyielded regions.
3. The early efforts by Papanastasiou and his co-workers were taken up by the author and his coworkers, who in a series of papers solved many benchmark problems and presented useful solutions always providing the yielded / unyielded regions in flow fields of interest.
4. It's difficult to find unyielded in a sentence.