parallel lines on parallel planes:parallel lines on parallel plains
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++_all the rows turned into rails +++++++++++++++++++++++++++++++++++++++++++++++++++++++_they got arrows pointed at snails +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++_i arose to their wails ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++++++++++++_flatness facilitates the mechanization of crop production ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++ ++++++++