-er -up b-p b-u bbb bbe bbi bbp bbr bbu be- beb bee bei bep ber beu bi- bib bie bii bip bir biu bpb bpe bpi bpp bpr bpu brb bre bri brp brr bru bub bue bui bup bur buu ebb ebe ebi ebp ebr ebu eeb eee eep eer eib eie eii eip eir eiu ep- epb epe epi epp epr epu erb ere eri erp err eru eu- eub eue eui eup eur ibb ibe ibi ibp ibr ibu ie- iee iei iep ier iib iie iii iip iir iiu ipb ipe ipi ipp ipr ipu ir- irb ire iri irp irr iru iu- iub iue iui iup iur p-p pbb pbe pbi pbp pbr pbu peb pee pei pep per peu pib pie pii pip pir piu ppb ppe ppi ppp ppr ppu prb pre pri prp prr pru pub pue pui pup pur puu rbb rbe rbi rbp rbr rbu re- reb ree rei rep rer reu rib rie rii rip rir rpb rpe rpi rpp rpr rpu rrb rri rrp rrr rru rub rue rui rup rur ruu ubb ube ubi ubp ubr ubu ueb uee uei uep uer uib uie uii uip uir uiu up- upb upe upi upp upr upu ur- urb ure uri urp urr uru uue uur uuu