a-a a-b a-i aaa aab aad aai aan aao aap aar ab- aba abb abd abi abn abo abp abr ad- ada adb add adi adn ado adp adr ai- aia aib aid aii ain aio aip air an- ana anb and ani ann ano anp anr aoa aob aod aoi aon aoo aop aor ap- apa apb apd api apn apo app apr ar- ara arb ard ari arn aro arp arr b-p baa bab bad bai ban bao bap bar bba bbb bbd bbi bbn bbo bbp bbr bda bdb bdd bdi bdo bdp bdr bi- bia bib bid bii bin bio bip bir bna bnb bnd bni bnn bno bnp bnr boa bob bod boi bon boo bop bor bpa bpb bpd bpi bpn bpo bpp bpr bra brb brd bri brn bro brp brr daa dab dad dai dan dao dap dar dba dbb dbd dbi dbn dbo dbp dbr dda ddb ddd ddi ddn ddo ddp ddr di- dia dib did dii din dio dip dir dna dnb dnd dni dnn dno dnp dnr doa dob dod doi don doo dop dor dpa dpb dpd dpi dpn dpo dpp dpr dra drb drd dri drn dro drp drr i-d ia- iaa iab iad iai ian iao iap iar iba ibb ibd ibi ibn ibo ibp ibr ida idb idd idi idn ido idp idr iia iib iid iii iin iio iip iir in- ina inb ind ini inn ino inp inr io- ioa iob iod ioi ion ioo iop ior ipa ipb ipd ipi ipn ipo ipp ipr ir- ira irb ird iri irn iro irp irr n-i naa nab nad nai nan nao nap nar nba nbb nbd nbi nbn nbo nbp nbr nda ndb ndd ndi ndn ndo ndp ndr nia nib nid nii nin nio nip nir nna nnb nni nnn nno nnp no- noa nob nod noi non noo nop nor npa npb npd npi npn npo npp npr nra nrb nrd nri nrn nro nrp nrr o-i oaa oab oad oai oan oao oap oar ob- oba obb obd obi obn obo obp obr oda odb odd odi odn odo odp odr oia oib oid oii oin oio oip oir on- ona onb ond oni onn ono onp onr oo- ooa oob ood ooi oon ooo oop oor op- opa opb opd opi opn opo opp opr or- ora orb ord ori orn oro orp orr p-p paa pab pad pai pan pao pap par pba pbb pbd pbi pbn pbo pbp pbr pda pdb pdd pdi pdn pdo pdp pdr pia pib pid pii pin pio pip pir pn- pna pnb pnd pni pnn pno pnp pnr poa pob pod poi pon poo pop por ppa ppb ppd ppi ppn ppo ppp ppr pra prb prd pri prn pro prp prr ra- raa rab rad rai ran rao rap rar rba rbb rbd rbi rbn rbo rbp rbr rda rdb rdd rdi rdn rdo rdp rdr ria rib rid rii rin rio rip rir rna rnb rnd rni rnn rno rnp rnr roa rob rod roi ron roo rop ror rpa rpb rpd rpi rpn rpo rpp rpr rra rrb rrd rri rrn rrp rrr