original: in addition there are 10 ground-level stations and four above ground .
simplifications: there are also 10 stations at ground level and four above ground . there are not only 10 ground-level stations but also 4 stations above ground . in addition to 10 ground-level stations there are four above ground . there are 10 ground-level stations and four above ground . additionally , there are 10 ground level stations and four above ground . in addition , there are 10 ground level and 4 above ground stations . also , there are 10 ground level stations and four above ground . in addition , there are 10 ground-level stations and four above .