 By [R2], the respondent agrees that all mice are grey, while by [R3] he denies that all cats are blue. To concede a sentence is to agree that what the sentence signifies according to its standard meaning is the case, but to concede that a certain sentence is true is to agree that what the sentence signifies in the casus is the case. These may or may not be the same depending on the casus. ([SophAs]  412)[12]