-er a-a a-b aaa aab aae aaf aah aao aap aar ab- aba abb abe abf abh abo abp abr aea aeb aee aef aeh aeo aep aer af- afa afb afe aff afh afo afp afr aha ahb ahe ahf ahh aho ahp ahr aoa aob aoe aof aoh aoo aop aor ap- apa apb ape apf aph apo app apr ar- ara arb are arf arh aro arp arr b-p baa bab bae baf bah bao bap bar bba bbb bbe bbf bbh bbo bbp bbr be- bea beb bee bef beh beo bep ber bfa bfb bfe bff bfh bfo bfp bfr bha bhb bhe bhf bhh bho bhp bhr boa bob boe bof boh boo bop bor bpa bpb bpe bpf bph bpo bpp bpr bra brb bre brf brh bro brp brr eaa eab eae eaf eah eao eap ear eba ebb ebe ebf ebh ebo ebp ebr eea eeb eee eef eeo eep eer ef- efa efb efe eff efh efo efp efr eha ehb ehe ehf ehh eho ehp ehr eo- eoa eob eoe eof eoh eoo eop eor ep- epa epb epe epf eph epo epp epr era erb ere erf erh ero erp err faa fab fae faf fah fao fap far fba fbb fbe fbf fbh fbo fbp fbr fea feb fee fef feh feo fep fer ffa ffe fff ffh ffo ffp ffr fha fhb fhe fhf fhh fho fhp fhr foa fob foe fof foh foo fop for fpa fpb fpe fph fpo fpp fpr fra frb fre frf frh fro frp frr haa hab hae haf hah hao hap har hba hbb hbe hbf hbh hbo hbp hbr he- hea heb hee hef heh heo hep her hfa hfb hfe hff hfh hfo hfp hfr hha hhb hhe hhf hhh hho hhp hhr hoa hob hoe hof hoh hoo hop hor hpa hpb hpe hpf hph hpo hpp hpr hr- hra hrb hre hrf hrh hro hrp hrr oaa oab oae oaf oah oao oap oar ob- oba obb obe obf obh obo obp obr oea oeb oee oef oeh oeo oep oer of- ofa ofb ofe off ofo ofp ofr oha ohe ohf ohh oho ohp ohr oo- ooa oob oof ooh ooo oop oor op- opa opb ope opf oph opo opp opr or- ora orb ore orf orh oro orp orr p-p paa pab pae paf pah pao pap par pba pbb pbe pbf pbo pbp pbr pea peb pee pef peh peo pep per pfa pfb pfe pff pfo pfp pfr pha phb phe phf pho php phr poa pob poe pof poh poo pop por ppa ppb ppe ppf pph ppo ppp ppr pra prb pre prf prh pro prp prr ra- raa rab rae raf rah rao rap rar rba rbb rbe rbf rbh rbo rbp rbr re- rea reb ree ref reh reo rep rer rfa rfb rfe rff rfh rfo rfp rfr rh- rha rhb rhe rhf rhh rho rhp rhr roa rob roe rof roh roo rop ror rpa rpb rpe rpf rph rpo rpp rpr rra rrb rrf rrh rrp rrr