Anchor: A coal with 4 percent sulfur, conservatively, will require 32 tons* of limestone per hour, or 0.064 tons per MWe per hour.
Entailed: Coal with 4% sulfur needs 32 tons of limestone an hour 
Contradiction: Coal with sulfur doesn't need limestone 
Contradiction: The men are on a bus.
Contradiction: Russia used 100 anti-missles to protect Moscow.
Contradiction: Adults stand in silence at home.
Contradiction: I think that they are useful because they make it easy to check messages.