<https://vinhnguyen.vn/may-tinh-tien/may-tinh-tien-casio-se-s6000.html#faq_page>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://vinhnguyen.vn/may-tinh-tien/may-tinh-tien-casio-se-s6000.html>