Anchor: Limestone is the reagent used in LSFO to remove SO2 from the flue gas stream.
Entailed: Limestone is a reagent.
Contradiction: Limestone is not a reagent.
Contradiction: They rose slowly without making a sound.
Contradiction: A person is playing soccer.
Contradiction: They did nothing while we were out. 
Contradiction: Tommy said "The Young Adventurers, Ltd.!"