What is the best thing to put in the permanent upgrade slot

permen4d slotp>Hi people, p>p>i´m playing the 1.0501 beta version of cookie clicker, where you can purchase permanent upgrade slots with your heavenly chips. p>p>The descriptionSelamat Datang di Halaman Login, Daftar dan Link Alternatif Terbaru Permen4D. Selamat bermain dan semoga beruntung