The Wilcox Rank Sum Test The Permutation Test

Consider two distinct samples drawn from separate populations: one comprising m=10 subjects from population A and the other consisting of n=9 subjects from population B. To assess whether the location parameter of population A exceeds that of population B, you can employ either (a) the Wilcox rank-sum test or (b) the permutation test on the difference in sample means. Determine the smallest achievable p-values for each test. (That is, there exist some data sets with m=10 and n=9, on which the calculated p-value equals the answer you given.)