Anchor: One should allow a few extra days for contingencies
Entailed: One may wish to allow extra days for unforeseen circumstances.
Contradiction: One does not need to allow any extra days.
Contradiction: Azay is not near any source of water. 
Contradiction: A person signing something.
Contradiction: two girls are doing nothing
Contradiction: Tuppence was greatly surprised and she raised her eyes, you really havent been doing this for a while?