a-a a-b a-i a-t aaa aab aad aai aao aap aar aat ab- aba abb abd abi abo abp abr abt ad- ada adb add adi ado adp adr adt ai- aia aib aid aii aio aip air ait aoa aob aod aoi aoo aop aor aot ap- apa apb apd api apo app apr apt ar- ara arb ard ari aro arp arr art at- ata atb atd ati ato atp atr att b-p baa bab bad bai bao bap bar bat bba bbb bbd bbi bbo bbp bbr bbt bda bdb bdd bdi bdo bdp bdr bdt bi- bia bib bid bii bio bip bir bit boa bob bod boi boo bop bor bot bpa bpb bpd bpi bpo bpp bpr bpt bra brb brd bri bro brp brr brt bta btb btd bti bto btp btr btt daa dab dad dai dao dap dar dat dba dbb dbd dbi dbo dbp dbr dbt dda ddb ddd ddi ddo ddp ddr ddt di- dia dib did dii dio dip dir dit doa dob dod doi doo dop dor dot dpa dpb dpd dpi dpo dpp dpr dpt dra drb drd dri dro drp drr drt dta dtb dtd dti dto dtp dtr dtt i-d ia- iaa iab iad iai iao iap iar iat iba ibb ibd ibi ibo ibp ibr ibt ida idb idd idi ido idp idr idt iia iib iid iii iio iip iir iit io- ioa iob iod ioi ioo iop ior iot ipa ipb ipd ipi ipo ipp ipr ipt ir- ira irb ird iri iro irp irr irt ita itb itd iti ito itp itt o-i oaa oab oad oai oao oap oar oat ob- oba obb obd obi obo obp obr obt oda odb odd odi odo odp odr odt oia oib oid oii oio oip oir oit oo- ooa oob ood ooi ooo oop oor oot op- opa opb opd opi opo opp opr opt or- ora orb ord ori oro orp orr ort ot- ota otb otd oti oto otp otr ott p-p paa pab pad pai pao pap par pat pba pbb pbd pbi pbo pbp pbr pbt pda pdb pdd pdi pdo pdp pdr pdt pia pib pid pii pio pip pir pit poa pob pod poi poo pop por pot ppa ppb ppd ppi ppo ppp ppr ppt pra prb prd pri pro prp prr prt pt- pta ptb ptd pti pto ptp ptr ptt ra- raa rab rad rai rao rap rar rat rba rbb rbd rbi rbo rbp rbr rbt rda rdb rdd rdi rdo rdp rdr rdt ria rib rid rii rio rip rir rit roa rob rod roi roo rop ror rot rpa rpb rpd rpi rpo rpp rpr rpt rra rrb rrd rri rrp rrr rrt rta rtb rtd rti rto rtp rtr rtt taa tab tad tai tao tap tar tat tba tbb tbd tbi tbo tbp tbr tbt tda tdb tdd tdi tdo tdp tdr tdt tia tib tid tii tio tip tir tit to- toa tob tod toi too top tor tot tpa tpb tpd tpi tpo tpp tpr tpt tra trb trd tri tro trp trr trt tta ttb ttd tti tto ttp ttr ttt