Usually articles just employ a single term (13 articles), two terms (18 articles) or three terms (13 articles), but some articles employ quite a number of different combinations. The highest was in an article with 19 different terms in only one paper (Rozzi (2018)).
Rozzi, Ricardo. (2018). LA FILOSOFÍA AMBIENTAL DE CAMPO Y LA ECORREGIÓN SUBANTÁRTICA DE MAGALLANES COMO UN LABORATORIO NATURAL EN EL ANTROPOCENO. Magallania. 46. 7-15. 10.4067/S0718-22442018000100007.