Anchor: And since allergies rarely shorten life spans or discourage mates, it is unlikely natural selection will ever weed them out.
Entailed: Since allergies have little impact on lifespans or the attraction of mates, natural selection probably won't wipe them out.
Contradiction: Because most people with allergies die in childhood, natural selection is likely to eliminate them within a few generations.
Contradiction: Two people try on clothes in a store.
Contradiction: The air operation is not a ground force.
Contradiction: Tuppence thought about it for five hours before saying no. 
Contradiction: A skateboarder rail slides a set of ten stairs.