what are all the teams in the league?
cordoba cf, cd malaga, granada cf, ud las palmas, recreativo de huelva, levante ud, hercules cf, real murcia, real jaen, cadiz cf, cd cartagena, cd mestalla, albacete balompie, cd san fernando, atletico ceuta, cd villarrobledo
which ones had a negative goal difference?
cadiz cf, cd cartagena, albacete balompie, cd san fernando, atletico ceuta, cd villarrobledo
of those, which had the worst goal difference?
cd villarrobledo