def _edges(self, X, Y):
N = X.shape[<NUM_LIT:0>]<EOL>if self.orientation == '<STR_LIT>':<EOL><INDENT>return [list(zip(X[i], Y[i])) for i in range(<NUM_LIT:1>, N-<NUM_LIT:1>)]<EOL><DEDENT>else:<EOL><INDENT>return [list(zip(Y[i], X[i])) for i in range(<NUM_LIT:1>, N-<NUM_LIT:1>)]<EOL><DEDENT>
Return the separator line segments; helper for _add_solids.