Text: and once they get the foundation poured then they they apply tension to that iron bar which compresses the concrete and makes it more uh stable more stable and and puts more strength into it
Entailment: They apply tension to that iron bar once they get the foundation poured, that in turn compresses the concrete, and makes it more stable, puts the strength into it.
Contradiction: They never apply tension to that iron bar, it could break the whole construction.