# Tell and deal puzzle

p, q and r are three positive integers satisfying p< q< r, such that q is the arithmetic mean of p and r.

Determine all possible triplet(s) (p, q, r) that satisfy both the cryptarithmetic equations, where each of the capital letters denotes a different decimal digit from 0 to 9 and, none of T and D can be zero.

r4 – q4 = TELL, and:
q4 – p4 = DEAL.