bbuss brrrr brunn bruns bruss bruun bunun bunus burbs burn- burns burps burrs burru burun burus bussu busur busuu n-p-n n-sub nsnps nu-nu nubus nunns nunun nupur nursu nurun nurus nusus p-n-p pnsup prun- pruss psbbn punbb punss purrs purus puurs rrsps rubup rubus runup s-bus snbrn snrnp snrpb snub- snubs snurp snuss sprun spurn spurr spurs srprb sssrb sssss subbu subss sunbs sunpu sunup supps supur surpu surur surus susun susus suuns unnun unnur unrun unsu unsub unsun unurn uprun upsun ursus urubu ussun usurp uuuuu