Anchor: Begun after the Duomo in 1173, it began to lean when only three of its eight stories had been completed (the Duomo is also marginally off-kilter).
Entailed: It's construction began after the Duomo in 1173.
Contradiction: It collapsed from leaning too far.
Contradiction: No pages.
Contradiction: Have you heard about bugs even though you haven't heard about tornados? 
Contradiction: I've had hangovers before, and I went to work and functioned fine.
Contradiction: Can referrals be effectively accomplished?