* Part one - various cells
  :PROPERTIES:
  :CUSTOM_ID: part-one---various-cells
  :END:

Here we have a markdown cell

with two blank lines

Now we have a markdown cell
with a code block inside it

#+BEGIN_SRC python
  1 + 1
#+END_SRC

After that cell we'll have a code cell

#+BEGIN_SRC python
  2 + 2


  3 + 3
#+END_SRC

Followed by a raw cell

* Part two - cell metadata
  :PROPERTIES:
  :CUSTOM_ID: part-two---cell-metadata
  :END:

This is a markdown cell with cell metadata ={"key": "value"}=

#+BEGIN_SRC python
  """This is a code cell with metadata `{"tags":["parameters"], ".class":null}`"""
#+END_SRC
