  The purpose of this paper is to discuss a phase diagram of hole-doped
cuprates. Hole-doped cuprates have a very rich phase diagram as a function of
doping. This is due to a charge inhomogeneity in CuO_2 planes: the charge
distribution in CuO_2 planes is inhomogeneous both on a nanoscale and
macroscale. Depending on doping level, the CuO_2 planes comprise at least four
different types of clusters having a size of a few nanometers. Each type of
clusters has its own features. As a consequence, the common phase diagram
consists of, at least, seven different energy/temperature scales. As an
example, we consider a phase diagram of Bi2212.
