mots occurence moyenne id_formation source_field 0 maitriser 1 0.17 LPP_0002 title 1 base 1 0.17 LPP_0002 title 2 voltaire 1 0.17 LPP_0002 title 3 grammaire 1 0.17 LPP_0002 title 4 orthographe 1 0.17 LPP_0002 title 5 certificat 1 0.17 LPP_0002 title