-er -up a-a a-b a-c aaa aab aac aad aae aao aap aar aau ab- aba abb abc abd abe abo abp abr abu ac- aca acb acc acd ace aco acp acr acu ad- ada adb adc add ade ado adp adr adu aea aeb aec aed aee aeo aep aer aeu aoa aob aoc aod aoe aoo aop aor aou ap- apa apb apc apd ape apo app apr apu ar- ara arb arc ard are aro arp arr aru au- aua aub auc aud aue auo aup aur b-p b-u baa bab bac bad bae bao bap bar bau bba bbb bbc bbd bbe bbo bbp bbr bbu bca bcb bcc bcd bce bco bcp bcr bcu bda bdb bdc bdd bde bdo bdp bdr bdu be- bea beb bec bed bee beo bep ber beu boa bob boc bod boe boo bop bor bou bpa bpb bpc bpd bpe bpo bpp bpr bpu bra brb brd bre bro brp brr bru bua bub buc bud bue buo bup bur buu c-- caa cab cac cad cae cao cap car cau cba cbb cbc cbd cbe cbo cbp cbr cbu cca ccb ccc ccd cce cco ccp ccr ccu cda cdb cdc cdd cde cdo cdp cdr cdu ce- cea ceb cec ced cee ceo cep cer ceu co- coa cob coc cod coe coo cop cor cou cpa cpb cpc cpd cpe cpo cpp cpr cpu cra crb crc crd cre cro crp crr cru cua cub cuc cud cue cuo cup cur cuu daa dab dac dad dae dao dap dar dau dba dbb dbc dbd dbe dbo dbp dbr dbu dca dcb dcc dcd dce dco dcp dcr dcu dda ddb ddc ddd dde ddo ddp ddr ddu de- dea deb dec ded dee deo dep der deu doa dob doc dod doe doo dop dor dou dpa dpb dpc dpd dpe dpo dpp dpr dpu dra drb drc drd dre dro drp drr dru dua dub duc dud due duo dup dur eaa eab eac ead eae eao eap ear eau eba ebb ebc ebd ebe ebo ebp ebr ebu ec- eca ecb ecc ecd ece eco ecr ecu ed- eda edb edc edd ede edo edp edr edu eea eeb eec eed eee eeo eep eer eo- eoa eob eoc eod eoe eoo eop eor eou ep- epa epb epc epd epe epo epp epr epu era erb erc erd ere ero erp err eru eu- eua eub euc eud eue eup eur oaa oab oac oad oae oao oap oar oau ob- oba obb obc obd obe obo obp obr obu oc- oca ocb occ ocd oco ocp ocr ocu oda odb odc odd ode odo odp odr odu oea oeb oec oed oee oeo oep oer oo- ooa oob ooc ood ooo oop oor op- opa opb opc opd ope opo opp opr or- ora orb orc ord ore oro orp orr oru ou- oua ouc oud oue ouo oup our p-p paa pab pac pad pae pao pap par pau pba pbb pbc pbd pbe pbo pbp pbr pbu pca pcb pcc pcd pce pco pcp pcr pcu pda pdb pdc pdd pde pdo pdp pdr pdu pea peb pec ped pee peo pep per peu poa pob poc pod poe poo pop por pou ppa ppb ppc ppd ppe ppo ppp ppr ppu pra prb prc prd pre pro prp prr pru pua pub puc pud pue pup pur puu ra- raa rab rac rad rae rao rap rar rau rba rbb rbc rbd rbe rbo rbp rbr rbu rca rcb rcc rcd rce rco rcp rcr rcu rda rdb rdc rdd rde rdo rdp rdr rdu re- rea reb rec red ree reo rep rer reu roa rob roc rod roe roo rop ror rou rpa rpb rpc rpd rpe rpo rpp rpr rpu rra rrb rrc rrd rrp rrr rru rua rub ruc rud rue ruo rup rur ruu ua- uaa uab uac uad uae uao uap uar uau uba ubb ubc ube ubo ubp ubr ubu uca ucb ucc ucd uce uco ucp ucr ucu uda udb udc udd ude udo udp udr udu uea ueb uec ued uee uep uer uoa uob uoc uod uoe uoo uop uor up- upa upb upc upd upe upo upp upr upu ur- ura urb urc urd ure uro urp urr uru uua uuc uue uur uuu