Part,  Chapter, Paragraph

1    I,     2.  7    | challenges are described below.~ ~Megacities. The start of the twenty-first
2    I,     2.  7    |          centre stage. Cities and megacities are indeed the centre of
3    I,     2.  7    |       focuses on large cities and megacities, while little work is invested
4  Key,   Ap5.  0.  0|     measles~measles-mumps-rubella~megacities~megacity~melanoma~melanomas~