-er a-a a-b aaa aab aad aae aah aao aap aar ab- aba abb abd abe abh abo abp abr ad- ada adb add ade adh ado adp adr aea aeb aed aee aeh aeo aep aer aha ahb ahd ahe ahh aho ahp ahr aoa aob aod aoe aoh aoo aop aor ap- apa apb apd ape aph apo app apr ar- ara arb ard are arh aro arp arr b-p baa bab bad bae bah bao bap bar bba bbb bbd bbe bbh bbo bbp bbr bda bdb bdd bde bdh bdo bdp bdr be- bea beb bed bee beh beo bep ber bha bhb bhd bhe bhh bho bhp bhr boa bob bod boe boh boo bop bor bpa bpb bpd bpe bph bpo bpp bpr bra brb brd bre brh bro brp brr daa dab dad dae dah dao dap dar dba dbb dbd dbe dbh dbo dbp dbr dda ddb ddd dde ddh ddo ddp ddr de- dea deb ded dee deh deo dep der dh- dha dhb dhd dhe dhh dho dhp dhr doa dob dod doe doh doo dop dor dpa dpb dpd dpe dph dpo dpp dpr dra drb drd dre dro drp drr eaa eab ead eae eah eao eap ear eba ebb ebd ebe ebh ebo ebp ebr ed- eda edb edd ede edh edo edp edr eea eeb eed eee eeo eep eer eha ehb ehd ehe ehh eho ehp ehr eo- eoa eob eod eoe eoh eoo eop eor ep- epa epb epd epe eph epo epp epr era erb erd ere erh ero erp err haa hab had hae hah hao hap har hba hbb hbd hbe hbh hbo hbp hbr hda hdb hdd hde hdh hdo hdp hdr he- hea heb hed hee heh heo hep her hha hhb hhd hhe hhh hho hhp hhr hoa hob hod hoe hoh hoo hop hor hpa hpb hpd hpe hph hpo hpp hpr hr- hra hrb hrd hre hrh hro hrp hrr oaa oab oad oae oah oao oap oar ob- oba obb obd obe obh obo obp obr oda odb odd ode odh odo odp odr oea oeb oed oee oeh oeo oep oer oha ohd ohe ohh oho ohp ohr oo- ooa oob ood ooh ooo oop oor op- opa opb opd ope oph opo opp opr or- ora orb ord ore orh oro orp orr p-p paa pab pad pae pah pao pap par pba pbb pbd pbe pbo pbp pbr pda pdb pdd pde pdh pdo pdp pdr pea peb ped pee peh peo pep per pha phb phd phe pho php phr poa pob pod poe poh poo pop por ppa ppb ppd ppe pph ppo ppp ppr pra prb prd pre prh pro prp prr ra- raa rab rad rae rah rao rap rar rba rbb rbd rbe rbh rbo rbp rbr rda rdb rdd rde rdh rdo rdp rdr re- rea reb red ree reh reo rep rer rh- rha rhb rhd rhe rhh rho rhp rhr roa rob rod roe roh roo rop ror rpa rpb rpd rpe rph rpo rpp rpr rra rrb rrd rrh rrp rrr