Anchor: In architecture, the Romans made a quantum leap forward from the Greek structures of columns and beams by developing the arch, vault, and dome, well suited to the needs of the empire.
Entailed: The empire found use for arches, vaults and domes.
Contradiction: Greek structures were superior to Roman structures in every way.
Contradiction: They wanted to talk about the Canadian programs successes. 
Contradiction: A person is performing music.
Contradiction: A woman is working alone at a computer.
Contradiction: A bearded man plays guitar.