name a office holder whose predecessor is leif arne heløe and has son named marte gerhardsen ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Leif_Arne_Heløe sep_dot var_uri dbo_child dbr_Marte_Gerhardsen sep_dot var_uri a dbo_OfficeHolder brack_close