input: Write a python function to create a dictionary with specified key-value pairs.
  assert create_dict() == {'a': 'alpha', 'g': 'gamma', 'o': 'omega'}
  assert 'a' in create_dict()
  assert create_dict().get('g') == 'gamma'
output: def create_dict():
      return {'a': 'alpha', 'g': 'gamma', 'o': 'omega'}