-er a-a a-b a-i aaa aab aad aae aai aan aao aap aar ab- aba abb abd abe abi abn abo abp abr ad- ada adb add ade adi adn ado adp adr aea aeb aed aee aei aen aeo aep aer ai- aia aib aid aie aii ain aio aip air an- ana anb and ane ani ann ano anp anr aoa aob aod aoe aoi aon aoo aop aor ap- apa apb apd ape api apn apo app apr ar- ara arb ard are ari arn aro arp arr b-p baa bab bad bae bai ban bao bap bar bba bbb bbd bbe bbi bbn bbo bbp bbr bda bdb bdd bde bdi bdo bdp bdr be- bea beb bed bee bei ben beo bep ber bi- bia bib bid bie bii bin bio bip bir bna bnb bnd bne bni bnn bno bnp bnr boa bob bod boe boi bon boo bop bor bpa bpb bpd bpe bpi bpn bpo bpp bpr bra brb brd bre bri brn bro brp brr daa dab dad dae dai dan dao dap dar dba dbb dbd dbe dbi dbn dbo dbp dbr dda ddb ddd dde ddi ddn ddo ddp ddr de- dea deb ded dee dei den deo dep der di- dia dib did die dii din dio dip dir dna dnb dnd dne dni dnn dno dnp dnr doa dob dod doe doi don doo dop dor dpa dpb dpd dpe dpi dpn dpo dpp dpr dra drb drd dre dri drn dro drp drr eaa eab ead eae eai ean eao eap ear eba ebb ebd ebe ebi ebn ebo ebp ebr ed- eda edb edd ede edi edn edo edp edr eea eeb eed eee een eeo eep eer eia eib eid eie eii ein eio eip eir en- ena enb end ene eni enn eno enp enr eo- eoa eob eod eoe eoi eon eoo eop eor ep- epa epb epd epe epi epn epo epp epr era erb erd ere eri ern ero erp err i-d ia- iaa iab iad iae iai ian iao iap iar iba ibb ibd ibe ibi ibn ibo ibp ibr ida idb idd ide idi idn ido idp idr ie- iea ied iee iei ien iep ier iia iib iid iie iii iin iio iip iir in- ina inb ind ine ini inn ino inp inr io- ioa iob iod ioe ioi ion ioo iop ior ipa ipb ipd ipe ipi ipn ipo ipp ipr ir- ira irb ird ire iri irn iro irp irr n-i naa nab nad nae nai nan nao nap nar nba nbb nbd nbe nbi nbn nbo nbp nbr nda ndb ndd nde ndi ndn ndo ndp ndr ne- nea neb ned nee nei nen neo nep ner nia nib nid nie nii nin nio nip nir nna nnb nne nni nnn nno nnp no- noa nob nod noe noi non noo nop nor npa npb npd npe npi npn npo npp npr nra nrb nrd nre nri nrn nro nrp nrr o-i oaa oab oad oae oai oan oao oap oar ob- oba obb obd obe obi obn obo obp obr oda odb odd ode odi odn odo odp odr oea oeb oed oee oei oen oeo oep oer oia oib oid oie oii oin oio oip oir on- ona onb ond one oni onn ono onp onr oo- ooa oob ood ooi oon ooo oop oor op- opa opb opd ope opi opn opo opp opr or- ora orb ord ore ori orn oro orp orr p-p paa pab pad pae pai pan pao pap par pba pbb pbd pbe pbi pbn pbo pbp pbr pda pdb pdd pde pdi pdn pdo pdp pdr pea peb ped pee pei pen peo pep per pia pib pid pie pii pin pio pip pir pn- pna pnb pnd pne pni pnn pno pnp pnr poa pob pod poe poi pon poo pop por ppa ppb ppd ppe ppi ppn ppo ppp ppr pra prb prd pre pri prn pro prp prr ra- raa rab rad rae rai ran rao rap rar rba rbb rbd rbe rbi rbn rbo rbp rbr rda rdb rdd rde rdi rdn rdo rdp rdr re- rea reb red ree rei ren reo rep rer ria rib rid rie rii rin rio rip rir rna rnb rnd rni rnn rno rnp rnr roa rob rod roe roi ron roo rop ror rpa rpb rpd rpe rpi rpn rpo rpp rpr rra rrb rrd rri rrn rrp rrr