what are all the clubs?
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 clubs got 27 points?
cd mestalla, albacete balompie, cd san fernando
which of these had a goal difference of +1?
cd mestalla