Anchor: One can surmise that a competitive postal service would do a better job of presenting technologically feasible, low-cost product options to mailers and either rejecting non-conforming pieces or levying surcharges.
Entailed: Someone can assume that the postal service would do a better job of finding ways to mail things effectively. 
Contradiction: Someone can assume that the postal service would do a poor job of finding ways to mail things effectively. f
Contradiction: Two people are relaxing after work.
Contradiction: The child is placing her foot in the waters.
Contradiction: Istanbul as a city is widely derided by the world.
Contradiction: A boat on calm water holds a man and a woman.