original_query: What is the process for selecting the Sultan, Raja Muda, and Raja Di-Hilir in the Perak state of Malaysia?
query: What is the process for selecting the Sultan, Raja Muda, and Raja Di-Hilir in Perak, Malaysia?
answer: The Sultan, Raja Muda (Crown Prince), and Raja Di-Hilir (Deputy Crown Prince) in Perak, Malaysia are selected by the Dewan Negara of Perak from among the most senior male princes descended from the 18th Sultan.  A son of the reigning Sultan cannot become Raja Muda if a more senior prince exists.