Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

The company noted that the commissioning of the new cement plant is part of its Africa expansion strategy and will be the fourth in the series after Ethiopia, Zambia and Cameroun, adding that cement plants due for commissioning this year include that of Senegal and South Africa, while construction works are ongoing in several other African countries.

Answer: product_or_material_produced: cement plant, cement