class Document:

    def __init__(self, title=None):
        self.Title = title
        self.Chapters = []

    def addChapter(self, chapter):
        self.Chapters.append(chapter)

2b2d54846f2bb3012ab87cf9be9ff0332bdd633d
<mask token>

class Document:
    <mask token>
    <mask token>

class Document:
    <mask token>

    def addChapter(self, chapter):
        self.Chapters.append(chapter)

class Document:

    def __init__(self, title=None):
        self.Title = title
        self.Chapters = []

    def addChapter(self, chapter):
        self.Chapters.append(chapter)
