Based on current literature describing the Egyptian language such as Hoch (1994), Allen (2013) and Selden (2015), it adds to my understanding that egyptians developed written phonograms which could represent just one sound, a combination of two sounds such as ms or up to three different sounds such as nfr.
My question is whether there are what one may call quadriliteral or tetraliteral signs standing for four different sounds? If so, where can I find references to them?