Investment Kutayika kapena sera yotayika ndi njira yachitsulo yomwe imagwiritsa ntchito njira ya sera yomwe yazunguliridwa ndi chipolopolo cha ceramic kuti chizipanga nkhungu. Mphezi zikauma, sera imasungunuka, kusiya nkhungu yokha. Kenako chomangirira chimapangidwa ndi kutsanulira chitsulo chosungunuka mu ceramic nkhungu. Zotayika za sex zosapanga dzimbiri zimaponya, imadziwikanso kuti ndalama zikugwiritsira ntchito, ndikugwiritsa ntchito njira yovuta yopangira sera kenako ndikugwiritsa ntchito njirayi kuti ipange nkhungu yomaliza. Njirayi imagwiritsidwa ntchito popanga mawonekedwe ndi magawo osiyanasiyana komanso molondola. Njira yotayikirira ya sera yomwe yakhala ikugwiritsidwa ntchito kwazaka zambiri ndipo wachita zambiri pa nthawi yophatikiza ukadaulo wamakono ndi maluso amakono. Masiku ano, kutaya kwa sera kumagwiritsidwa ntchito kupanga zinthu zosiyanasiyana, kuchokera ku zodzikongoletsera zazing'ono zazitali kumagulu akulu.