The Chamfer command creates a chamfer by removing or
adding a flat section from a selected edge. It creates a beveled
surface between the two original faces common to the selected edge.
Tangency: tangencies are taken into account so as to
fillet the entire edge and possible tangent edges.
Minimal: edges tangent to selected edges can be taken
into account to some extent. The application continues creating the
chamfer beyond the selected edge whenever it cannot do otherwise.