So, to develop relationships with tough customers, I would say that this kind of goes back to the same question before. Being able to actively listen to a customer, to a tough customer, to actively listen and understand, not just listen to listen, but to listen and understand, kind of find a common ground between the problem or whatever is being discussed about, whatever the situation is that's tough to the customer. You have to be open and honest. Again, it goes back to the same question of being open and honest with the customer. Let them know that you understand them. The customer wants to feel like that we care, that we're not just listening, we actually care about the things that they're saying. So we want to stay consistent, of course, being consistent with those tough customers and just let them know it's not always us. It could be the situation that has the customer so frustrated, so just actively listening, showing empathy, things of that nature.