export class Page {
  public title: string;
  public type: string;

  public summary?: string;
  public content: string;
  public exercises?: Exercise[];
};

export class Exercise {
  public name: string;
  public style: string;
  public description: string;
  public props: any;
  public graders?: Grader[];
};

export class Grader {
  public language: string;
  public style: string;
  public props: any;
};