  In the paper we introduce a notion of a key relation, which is similar to the
notion of a critical relation introduced by Keith A.Kearnes and \'Agnes
Szendrei. All clones on finite sets can be defined by only key relations. In
addition there is a nice description of all key relations on 2 elements. These
are exactly the relations that can be defined as a disjunction of linear
equations. In the paper we show that, in general key relations do not have such
a nice description. Nevertheless, we obtain a nice characterization of all key
relations preserved by a weak near-unanimity function. This characterization is
presented in the paper.
