With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: 28 Days (film) costars Elizabeth Perkins.
text_B: In military science , a soft-skinned vehicle is any vehicle that is not armored .. military science. military science. This includes trucks , motorcycles , jeeps and cars .. motorcycles. motorcycles. It can also include half-tracks and scouting vehicles , if they have little or no armor , but it is more likely to be a regular production model .. half-tracks. half-tracks. These can be used as general purpose workhorses , like a 53-seater coach or pick-up , a military police vehicle , or a car used for undercover work on the home front .. military police vehicle. military police vehicle
not_related.