What is the fine-grained topic of the following text: The first two AHEAD-2.0L PRODERGY machines were started up at Perawang mill in the first quarter of 2018, and the following six machines at OKI mill in the second and third quarters of 2018. Only return the topic.
Startup of AHEAD-2.0L PRODERGY machines at Perawang and OKI mills in 2018