-er -up a-a a-b aaa aab aae aao aap aar aau ab- aba abb abe abo abp abr abu aea aeb aee aeo aep aer aeu aoa aob aoe aoo aop aor aou ap- apa apb ape apo app apr apu ar- ara arb are aro arp arr aru au- aua aub aue auo aup aur b-p b-u baa bab bae bao bap bar bau bba bbb bbe bbo bbp bbr bbu be- bea beb bee beo bep ber beu boa bob boe boo bop bor bou bpa bpb bpe bpo bpp bpr bpu bra brb bre bro brp brr bru bua bub bue buo bup bur buu eaa eab eae eao eap ear eau eba ebb ebe ebo ebp ebr ebu eea eeb eee eeo eep eer eo- eoa eob eoe eoo eop eor eou ep- epa epb epe epo epp epr epu era erb ere ero erp err eru eu- eua eub eue eup eur oaa oab oae oao oap oar oau ob- oba obb obe obo obp obr obu oea oeb oee oeo oep oer oo- ooa oob ooo oop oor op- opa opb ope opo opp opr or- ora orb ore oro orp orr oru ou- oua oue ouo oup our p-p paa pab pae pao pap par pau pba pbb pbe pbo pbp pbr pbu pea peb pee peo pep per peu poa pob poe poo pop por pou ppa ppb ppe ppo ppp ppr ppu pra prb pre pro prp prr pru pua pub pue pup pur puu ra- raa rab rae rao rap rar rau rba rbb rbe rbo rbp rbr rbu re- rea reb ree reo rep rer reu roa rob roe roo rop ror rou rpa rpb rpe rpo rpp rpr rpu rra rrb rrp rrr rru rua rub rue ruo rup rur ruu ua- uaa uab uae uao uap uar uau uba ubb ube ubo ubp ubr ubu uea ueb uee uep uer uoa uob uoe uoo uop uor up- upa upb upe upo upp upr upu ur- ura urb ure uro urp urr uru uua uue uur uuu