  Lie symmetries of K(m,n) equations with time-dependent coefficients are
classified. Group classification is presented up to widest possible equivalence
groups, the usual equivalence group of the whole class for the general case and
conditional equivalence groups for special values of the exponents m and n.
Examples on reduction of K(m,n) equations (with initial and boundary
conditions) to nonlinear ordinary differential equations (with initial
conditions) are presented.
