-er a-a a-b a-i aaa aab aad aae aai aao aap aar ab- aba abb abd abe abi abo abp abr ad- ada adb add ade adi ado adp adr aea aeb aed aee aei aeo aep aer ai- aia aib aid aie aii aio aip air aoa aob aod aoe aoi aoo aop aor ap- apa apb apd ape api apo app apr ar- ara arb ard are ari aro arp arr b-p baa bab bad bae bai bao bap bar bba bbb bbd bbe bbi bbo bbp bbr bda bdb bdd bde bdi bdo bdp bdr be- bea beb bed bee bei beo bep ber bi- bia bib bid bie bii bio bip bir boa bob bod boe boi boo bop bor bpa bpb bpd bpe bpi bpo bpp bpr bra brb brd bre bri bro brp brr daa dab dad dae dai dao dap dar dba dbb dbd dbe dbi dbo dbp dbr dda ddb ddd dde ddi ddo ddp ddr de- dea deb ded dee dei deo dep der di- dia dib did die dii dio dip dir doa dob dod doe doi doo dop dor dpa dpb dpd dpe dpi dpo dpp dpr dra drb drd dre dri dro drp drr eaa eab ead eae eai eao eap ear eba ebb ebd ebe ebi ebo ebp ebr ed- eda edb edd ede edi edo edp edr eea eeb eed eee eeo eep eer eia eib eid eie eii eio eip eir eo- eoa eob eod eoe eoi eoo eop eor ep- epa epb epd epe epi epo epp epr era erb erd ere eri ero erp err i-d ia- iaa iab iad iae iai iao iap iar iba ibb ibd ibe ibi ibo ibp ibr ida idb idd ide idi ido idp idr ie- iea ied iee iei iep ier iia iib iid iie iii iio iip iir io- ioa iob iod ioe ioi ioo iop ior ipa ipb ipd ipe ipi ipo ipp ipr ir- ira irb ird ire iri iro irp irr o-i oaa oab oad oae oai oao oap oar ob- oba obb obd obe obi obo obp obr oda odb odd ode odi odo odp odr oea oeb oed oee oei oeo oep oer oia oib oid oie oii oio oip oir oo- ooa oob ood ooi ooo oop oor op- opa opb opd ope opi opo opp opr or- ora orb ord ore ori oro orp orr p-p paa pab pad pae pai pao pap par pba pbb pbd pbe pbi pbo pbp pbr pda pdb pdd pde pdi pdo pdp pdr pea peb ped pee pei peo pep per pia pib pid pie pii pio pip pir poa pob pod poe poi poo pop por ppa ppb ppd ppe ppi ppo ppp ppr pra prb prd pre pri pro prp prr ra- raa rab rad rae rai rao rap rar rba rbb rbd rbe rbi rbo rbp rbr rda rdb rdd rde rdi rdo rdp rdr re- rea reb red ree rei reo rep rer ria rib rid rie rii rio rip rir roa rob rod roe roi roo rop ror rpa rpb rpd rpe rpi rpo rpp rpr rra rrb rrd rri rrp rrr