-er a-a a-b aaa aab aad aae aag aao aap aar ab- aba abb abd abe abg abo abp abr ad- ada adb add ade adg ado adp adr aea aeb aed aee aeg aeo aep aer ag- aga agb agd age agg ago agp agr aoa aob aod aoe aog aoo aop aor ap- apa apb apd ape apg apo app apr ar- ara arb ard are arg aro arp arr b-p baa bab bad bae bag bao bap bar bba bbb bbd bbe bbg bbo bbp bbr bda bdb bdd bde bdg bdo bdp bdr be- bea beb bed bee beg beo bep ber bga bgb bgd bge bgg bgo bgp bgr boa bob bod boe bog boo bop bor bpa bpb bpd bpe bpg bpo bpp bpr bra brb brd bre brg bro brp brr daa dab dad dae dag dao dap dar dba dbb dbd dbe dbg dbo dbp dbr dda ddb ddd dde ddg ddo ddp ddr de- dea deb ded dee deg deo dep der dga dgd dge dgg dgp dgr doa dob dod doe dog doo dop dor dpa dpb dpd dpe dpg dpo dpp dpr dra drb drd dre drg dro drp drr eaa eab ead eae eag eao eap ear eba ebb ebd ebe ebg ebo ebp ebr ed- eda edb edd ede edg edo edp edr eea eeb eed eee eeg eeo eep eer ega egb egd ege egg ego egp egr eo- eoa eob eod eoe eog eoo eop eor ep- epa epb epd epe epg epo epp epr era erb erd ere erg ero erp err g-d g-p gaa gab gad gae gag gao gap gar gba gbd gbe gbg gbo gbp gbr gda gdb gdd gde gdo gdp gdr ge- gea geb ged gee geg geo gep ger gga ggb ggd ggg ggo ggp ggr goa gob god goe gog goo gop gor gpa gpb gpd gpe gpg gpo gpp gpr gra grb grd gre grg gro grp grr oaa oab oad oae oag oao oap oar ob- oba obb obd obe obg obo obp obr oda odb odd ode odg odo odp odr oea oeb oed oee oeg oeo oep oer oga ogd oge ogg ogo ogp oo- ooa oob ood oog ooo oop oor op- opa opb opd ope opg opo opp opr or- ora orb ord ore org oro orp orr p-p paa pab pad pae pag pao pap par pba pbb pbd pbe pbg pbo pbp pbr pda pdb pdd pde pdg pdo pdp pdr pea peb ped pee peg peo pep per pga pgb pgd pge pgg pgo pgp pgr poa pob pod poe pog poo pop por ppa ppb ppd ppe ppg ppo ppp ppr pra prb prd pre prg pro prp prr ra- raa rab rad rae rag rao rap rar rba rbb rbd rbe rbg rbo rbp rbr rda rdb rdd rde rdg rdo rdp rdr re- rea reb red ree reg reo rep rer rga rgb rgd rge rgg rgo rgp rgr roa rob rod roe rog roo rop ror rpa rpb rpd rpe rpg rpo rpp rpr rra rrb rrd rrg rrp rrr