how many cars are the predecessor of cars similar to the aston martin rapide bertone jet 2+2 ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_Aston_Martin_Rapide_Bertone_Jet_2+2 dbo_relatedMeanOfTransportation var_x sep_dot var_x dbo_predecessor var_uri sep_dot var_x a dbo_Automobile brack_close