 B implicates that he doesn’t know where in Canada John spends the summer. The reasoning is as follows: B violates the Maxim of Quantity to be as informative as required. Since B is assumed to be cooperative, we can infer that he cannot satisfy the Maxim of Quantity without violating some other maxim. The best candidate is the sub-maxim of the Maxim of Quality, which requires you not to say anything for which you lack sufficient evidence. Hence, one can infer that B doesn’t know. Again, B has not asserted that he doesn’t know, but still managed to convey it in an indirect  manner.[7]