-er a-a a-b aaa aab aad aae aan aao aap aar ab- aba abb abd abe abn abo abp abr ad- ada adb add ade adn ado adp adr aea aeb aed aee aen aeo aep aer an- ana anb and ane ann ano anp anr aoa aob aod aoe aon aoo aop aor ap- apa apb apd ape apn apo app apr ar- ara arb ard are arn aro arp arr b-p baa bab bad bae ban bao bap bar bba bbb bbd bbe bbn bbo bbp bbr bda bdb bdd bde bdo bdp bdr be- bea beb bed bee ben beo bep ber bna bnb bnd bne bnn bno bnp bnr boa bob bod boe bon boo bop bor bpa bpb bpd bpe bpn bpo bpp bpr bra brb brd bre brn bro brp brr daa dab dad dae dan dao dap dar dba dbb dbd dbe dbn dbo dbp dbr dda ddb ddd dde ddn ddo ddp ddr de- dea deb ded dee den deo dep der dna dnb dnd dne dnn dno dnp dnr doa dob dod doe don doo dop dor dpa dpb dpd dpe dpn dpo dpp dpr dra drb drd dre drn dro drp drr eaa eab ead eae ean eao eap ear eba ebb ebd ebe ebn ebo ebp ebr ed- eda edb edd ede edn edo edp edr eea eeb eed eee een eeo eep eer en- ena enb end ene enn eno enp enr eo- eoa eob eod eoe eon eoo eop eor ep- epa epb epd epe epn epo epp epr era erb erd ere ern ero erp err naa nab nad nae nan nao nap nar nba nbb nbd nbe nbn nbo nbp nbr nda ndb ndd nde ndn ndo ndp ndr ne- nea neb ned nee nen neo nep ner nna nnb nne nnn nno nnp no- noa nob nod noe non noo nop nor npa npb npd npe npn npo npp npr nra nrb nrd nre nrn nro nrp nrr oaa oab oad oae oan oao oap oar ob- oba obb obd obe obn obo obp obr oda odb odd ode odn odo odp odr oea oeb oed oee oen oeo oep oer on- ona onb ond one onn ono onp onr oo- ooa oob ood oon ooo oop oor op- opa opb opd ope opn opo opp opr or- ora orb ord ore orn oro orp orr p-p paa pab pad pae pan pao pap par pba pbb pbd pbe pbn pbo pbp pbr pda pdb pdd pde pdn pdo pdp pdr pea peb ped pee pen peo pep per pn- pna pnb pnd pne pnn pno pnp pnr poa pob pod poe pon poo pop por ppa ppb ppd ppe ppn ppo ppp ppr pra prb prd pre prn pro prp prr ra- raa rab rad rae ran rao rap rar rba rbb rbd rbe rbn rbo rbp rbr rda rdb rdd rde rdn rdo rdp rdr re- rea reb red ree ren reo rep rer rna rnb rnd rnn rno rnp rnr roa rob rod roe ron roo rop ror rpa rpb rpd rpe rpn rpo rpp rpr rra rrb rrd rrn rrp rrr