-er -up b-p b-u bbb bbe bbi bbo bbp bbr bbu be- beb bee bei beo bep ber beu bi- bib bie bii bio bip bir biu bob boe boi boo bop bor bou bpb bpe bpi bpo bpp bpr bpu brb bre bri bro brp brr bru bub bue bui buo bup bur buu ebb ebe ebi ebo ebp ebr ebu eeb eee eeo eep eer eib eie eii eio eip eir eiu eo- eob eoe eoi eoo eop eor eou ep- epb epe epi epo epp epr epu erb ere eri ero erp err eru eu- eub eue eui eup eur ibb ibe ibi ibo ibp ibr ibu ie- iee iei iep ier iib iie iii iio iip iir iiu io- iob ioe ioi ioo iop ior iou ipb ipe ipi ipo ipp ipr ipu ir- irb ire iri iro irp irr iru iu- iub iue iui iup iur o-i ob- obb obe obi obo obp obr obu oeb oee oei oeo oep oer oib oie oii oio oip oir oiu oo- oob ooi ooo oop oor op- opb ope opi opo opp opr or- orb ore ori oro orp orr oru ou- oue oui ouo oup our p-p pbb pbe pbi pbo pbp pbr pbu peb pee pei peo pep per peu pib pie pii pio pip pir piu pob poe poi poo pop por pou ppb ppe ppi ppo ppp ppr ppu prb pre pri pro prp prr pru pub pue pui pup pur puu rbb rbe rbi rbo rbp rbr rbu re- reb ree rei reo rep rer reu rib rie rii rio rip rir rob roe roi roo rop ror rou rpb rpe rpi rpo rpp rpr rpu rrb rri rrp rrr rru rub rue rui ruo rup rur ruu ubb ube ubi ubo ubp ubr ubu ueb uee uei uep uer uib uie uii uio uip uir uiu uob uoe uoo uop uor up- upb upe upi upo upp upr upu ur- urb ure uri uro urp urr uru uue uur uuu