Anchor: Rules limit how much blood you can donate or sell at one sitting.
Entailed: Rules limit the amount of blood you can sell or donate in a sitting.
Contradiction: There is no limit to the amount of blood that can be donated in one sitting.
Contradiction: Rules do not limit the amount of blood you can sell or donate in a sitting.
Contradiction: There are no limits to how much blood you can donate.
Contradiction: The choir is outside.
Contradiction: There is a professional volleyball game in full swing.