Oromo farmers have contributed to world agriculture by cultivating and developing some of the worid's crop plants and in this way have discovered new domesticated varieties.
(Oromo farmers; have contributed; to world agriculture) Context(Oromo farmers have contributed,List([0, 30))):(Oromo farmers; have contributed to world agriculture by cultivating; )
Oromo farmers have contributed,List([0, 30))
Oromo farmers Oromo farmers
have contributed have contributed to world agriculture by cultivating
to world agriculture