Twenty-one persons hold different designations in a bank: CEO, MD, DGM, AGM, Manager, and Clerk. The seniority order is CEO (highest), MD, DGM, AGM, M...

Twenty-one persons hold different designations in a bank: CEO, MD, DGM, AGM, Manager, and Clerk. The seniority order is CEO (highest), MD, DGM, AGM, Manager, and Clerk (lowest). The number of persons at any designation is exactly one more than the number at the immediate senior designation. For example, if there are 3 AGMs, then there are 4 Managers, and so on.
Given: - P, T, and W hold the same designation. - S is senior to W. - X is senior to U, and U is not an AGM. - R and V hold the same designation. - Neither B nor H is a Manager, but both share the same designation. - D, E, and H share the same designation, which is junior to Q and T. - Q is junior to U. - The number of persons senior to Q equals the number senior to T. - X is junior to N but senior to R. - A, L, and M share the same designation. - W is not a Manager. - R is neither Manager nor Clerk. - Z and Y are senior to G and O.
Question: How many persons are senior to V?