which subsidiary of norwegian air shuttle serves both oslo airport and palma de mallorca airport ?
select distinct var_uri where brack_open dbr_Norwegian_Air_Shuttle dbo_subsidiary var_uri sep_dot var_uri dbo_targetAirport dbr_Oslo_Airport,_Gardermoen sep_dot var_uri dbo_targetAirport dbr_Palma_de_Mallorca_Airport sep_dot brack_close