Knights, Knaves, and Normals

There is an island in which certain inhabitants called "knights" always tell the

truth and others called "knaves" always lie. But there are also "normals", who

sometimes lie and sometimes tell the truth. It is assumed that every inhabitant

of the island is either a knight, a knave, or a normal.

In the problem there are 3 inhabitants, who are denoted by A, B, C. At least one

is a knight, and at least one is a knave. Each of them make a statement.

Who is a knight, who is a knave, and who is a normal?