-er -up a-a a-b aaa aab aad aae aap aar aau ab- aba abb abd abe abp abr abu ad- ada adb add ade adp adr adu aea aeb aed aee aep aer aeu ap- apa apb apd ape app apr apu ar- ara arb ard are arp arr aru au- aua aub aud aue aup aur b-p b-u baa bab bad bae bap bar bau bba bbb bbd bbe bbp bbr bbu bda bdb bdd bde bdp bdr bdu be- bea beb bed bee bep ber beu bpa bpb bpd bpe bpp bpr bpu bra brb brd bre brp brr bru bua bub bud bue bup bur buu daa dab dad dae dap dar dau dba dbb dbd dbe dbp dbr dbu dda ddb ddd dde ddp ddr ddu de- dea deb ded dee dep der deu dpa dpb dpd dpe dpp dpr dpu dra drb drd dre drp drr dru dua dub dud due dup dur eaa eab ead eae eap ear eau eba ebb ebd ebe ebp ebr ebu ed- eda edb edd ede edp edr edu eea eeb eed eee eep eer ep- epa epb epd epe epp epr epu era erb erd ere erp err eru eu- eua eub eud eue eup eur p-p paa pab pad pae pap par pau pba pbb pbd pbe pbp pbr pbu pda pdb pdd pde pdp pdr pdu pea peb ped pee pep per peu ppa ppb ppd ppe ppp ppr ppu pra prb prd pre prp prr pru pua pub pud pue pup pur puu ra- raa rab rad rae rap rar rau rba rbb rbd rbe rbp rbr rbu rda rdb rdd rde rdp rdr rdu re- rea reb red ree rep rer reu rpa rpb rpd rpe rpp rpr rpu rra rrb rrd rrp rrr rru rua rub rud rue rup rur ruu ua- uaa uab uad uae uap uar uau uba ubb ube ubp ubr ubu uda udb udd ude udp udr udu uea ueb ued uee uep uer up- upa upb upd upe upp upr upu ur- ura urb urd ure urp urr uru uua uue uur uuu