We now want to find X, and Y, that take equal values with at least 1-p' frequency and then all other pairs Xi and Y, can be coupled in the same way. Let Z be a random variable with uniform distribution from 0 to 1. Let X, be 0 if the value of Z is less than 1-p and 1 otherwise. Xi is a Bernoulli random variable. Let Y, be O if z