a-a a-b a-i aaa aab aag aai aao aap aas ab- aba abb abg abi abo abp abs ag- aga agb agg agi ago agp ags ai- aia aib aig aii aio aip ais aoa aob aog aoi aoo aop aos ap- apa apb apg api apo app aps as- asa asb asg asi aso asp ass b-p baa bab bag bai bao bap bas bba bbb bbg bbi bbo bbp bbs bga bgb bgg bgi bgo bgp bgs bi- bia bib big bii bio bip bis boa bob bog boi boo bop bos bpa bpb bpg bpi bpo bpp bps bsa bsb bsg bsi bso bsp bss g-p gaa gab gag gai gao gap gas gba gbg gbi gbo gbp gbs gga ggb ggg ggi ggo ggp ggs gia gib gig gii gio gip gis goa gob gog goi goo gop gos gpa gpb gpg gpi gpo gpp gps gsa gsb gsg gsi gso gsp gss ia- iaa iab iag iai iao iap ias iba ibb ibg ibi ibo ibp ibs iga igb igg igi igo igp igs iia iib iii iio iip iis io- ioa iob iog ioi ioo iop ios ipa ipb ipg ipi ipo ipp ips is- isa isb isg isi iso isp iss o-i oaa oab oag oai oao oap oas ob- oba obb obg obi obo obp obs oga ogg ogi ogo ogp ogs oia oib oii oio oip ois oo- ooa oob oog ooi ooo oop oos op- opa opb opg opi opo opp ops os- osa osb osg osi oso osp oss p-p paa pab pag pai pao pap pas pba pbb pbg pbi pbo pbp pbs pga pgb pgg pgi pgo pgp pgs pia pib pig pii pio pip pis poa pob pog poi poo pop pos ppa ppb ppg ppi ppo ppp pps ps- psa psb psg psi pso psp pss saa sab sag sai sao sap sas sba sbb sbg sbi sbo sbp sbs sga sgb sgg sgi sgo sgp sgs sia sib sig sii sio sip sis soa sob sog soi soo sop sos spa spb spg spi spo spp sps ss- ssa ssb ssg ssi sso ssp sss