... component of type (i), then the intersection in codimensionone of any two distinct components can only be a line.If there is no component of type (i), then the intersection in codimensionone of ... X2meeting along a conic. If there are THE K2 OF DEGENERATIONS OF SURFACES361other components, then there is a component Xmeeting all the rest along aline. Thus, the hyperplane section contains ... 3;• sn: the number of n-angles of G, i.e. the number of Sn-points of X, for n 4;• s:=n4sn: the total number of Sn-points of X, for all n 4;• wi: the valence of the ithvertex...