docs: def _split_chemical_equations(value):
      """
      Split a string with sequential chemical equations into separate strings.
  
      Each string in the returned iterable represents a single chemical equation
      of the input.
      See the docstrings of `ChemicalEquation` and `ChemicalSystem` for more.
  
      Parameters
      ----------
      value : `str`
          A string with sequential chemical equations in the mini-language (see
          notes on `ChemicalEquation`).
  
      Returns
      -------
      iterable of `str`
          An iterable of strings in the format specified by the mini-language
          (see notes on `ChemicalEquation`).
  
      Examples
      --------
      >>> from pyrrole.core import _split_chemical_equations
      >>> _split_chemical_equations('A + B -> C + D -> D + E <=> F + G <- H + I')
      ['A + B -> C + D', 'C + D -> D + E', 'D + E <=> F + G', 'F + G <- H + I']
  
      """
      pieces = _split_arrows(value)
      return [(pieces[i] +
               pieces[i + 1] +
               pieces[i + 2]).strip()
              for i in range(0, len(pieces) - 2, 2)]