a-a a-b a-i aaa aab aad aai aao aap aas ab- aba abb abd abi abo abp abs ad- ada adb add adi ado adp ads ai- aia aib aid aii aio aip ais aoa aob aod aoi aoo aop aos ap- apa apb apd api apo app aps as- asa asb asd asi aso asp ass b-p baa bab bad bai bao bap bas bba bbb bbd bbi bbo bbp bbs bda bdb bdd bdi bdo bdp bds bi- bia bib bid bii bio bip bis boa bob bod boi boo bop bos bpa bpb bpd bpi bpo bpp bps bsa bsb bsd bsi bso bsp bss daa dab dad dai dao dap das dba dbb dbd dbi dbo dbp dbs dda ddb ddd ddi ddo ddp dds di- dia dib did dii dio dip dis doa dob dod doi doo dop dos dpa dpb dpd dpi dpo dpp dps dsa dsb dsd dsi dso dsp dss i-d ia- iaa iab iad iai iao iap ias iba ibb ibd ibi ibo ibp ibs ida idb idd idi ido idp ids iia iib iid iii iio iip iis io- ioa iob iod ioi ioo iop ios ipa ipb ipd ipi ipo ipp ips is- isa isb isd isi iso isp iss o-i oaa oab oad oai oao oap oas ob- oba obb obd obi obo obp obs oda odb odd odi odo odp ods oia oib oid oii oio oip ois oo- ooa oob ood ooi ooo oop oos op- opa opb opd opi opo opp ops os- osa osb osd osi oso osp oss p-p paa pab pad pai pao pap pas pba pbb pbd pbi pbo pbp pbs pda pdb pdd pdi pdo pdp pds pia pib pid pii pio pip pis poa pob pod poi poo pop pos ppa ppb ppd ppi ppo ppp pps ps- psa psb psd psi pso psp pss saa sab sad sai sao sap sas sba sbb sbd sbi sbo sbp sbs sda sdb sdd sdi sdo sdp sds sia sib sid sii sio sip sis soa sob sod soi soo sop sos spa spb spd spi spo spp sps ss- ssa ssb ssd ssi sso ssp sss