Nigeria has produced many prolific writers. Many have won accolades for their work, including Daniel O. Fagunwa, Chinua Achebe, Wole Soyinka, Femi Osofisan, Ken Saro-Wiwa, Cyprian Ekwensi, Buchi Emecheta, Elechi Amadi and Ben Okri. Critically acclaimed writers of a younger generation include Chris Abani, Chimamanda Ngozi Adichie, Ikenna Uchechi Ogbonna, Expertsonike Groups, Sefi Atta, Helon Habila, Helen Oyeyemi, Nnedi Okorafor, Kachi A. Ozumba, Echezonachukwu Nduka, Sarah Ladipo Manyika, Chika Unigwe, Ayo Sogunro, and Wol-vriey.