Anchor: The maze of narrow alleys that link the houses can be confusing, as there are few street signs to guide you, but the Tourist Information Centre provides an invaluable guide.
Entailed: You can get a guide to the narrow alleys between the houses from the Tourist Information Centre.
Contradiction: It's very easy to navigate from one house to the next, so no guide is needed.
Contradiction: The Rue Oscura is the least pleasing of the ancient vaulted passages.
Contradiction: You never know when you'll be in one place. 
Contradiction: A platform held the fire.
Contradiction: Our current programs involving regulation could be more efficient.