low mars are poor with low unwind sail
gravity_on_mars is less_than_of_earth. gravity_on_mars is not less_than_of_earth. run_low is not run. low_beam is beam. lowest_level is not low_level. low_tide is not tide. lower_level is not low_level. low_beam is not beam. low_tide is tide. mars_gravity is not weaker_than_earths.