a-a a-b a-i aaa aab aag aai aak aap aar ab- aba abb abg abi abk abp abr ag- aga agb agg agi agk agp agr ai- aia aib aig aii aik aip air aka akb akg aki akk akp akr ap- apa apb apg api apk app apr ar- ara arb arg ari ark arp arr b-p baa bab bag bai bak bap bar bba bbb bbg bbi bbk bbp bbr bga bgb bgg bgi bgk bgp bgr bi- bia bib big bii bik bip bir bka bkb bkg bkk bkp bkr bpa bpb bpg bpi bpp bpr bra brb brg bri brk brp brr g-p gaa gab gag gai gak gap gar gba gbg gbi gbk gbp gbr gga ggb ggg ggi ggp ggr gia gib gig gii gik gip gir gka gkb gkp gpa gpb gpg gpi gpk gpp gpr gra grb grg gri grk grp grr ia- iaa iab iag iai iap iar iba ibb ibg ibi ibk ibp ibr iga igb igg igi igk igp igr iia iib iii iip iir ika ikb iki ikk ikr ipa ipb ipg ipi ipp ipr ir- ira irb irg iri irk irp irr ka- kaa kab kag kai kak kap kar kba kbb kbi kbk kbp kbr kga kgb kgi kgp kia kib kig kii kik kip kir kkb kki kkk kkp kkr kpa kpi kpk kpp kpr kra krg kri krk krp krr p-p paa pab pag pai pak pap par pba pbb pbg pbi pbk pbp pbr pga pgb pgg pgi pgk pgp pgr pia pib pig pii pik pip pir pka pkb pkg pki pkp pkr ppa ppb ppg ppi ppk ppp ppr pra prb prg pri prk prp prr ra- raa rab rag rai rak rap rar rba rbb rbg rbi rbk rbp rbr rga rgb rgg rgi rgk rgp rgr ria rib rig rii rik rip rir rkb rkg rkk rkp rpa rpb rpg rpi rpk rpp rpr rra rrb rrg rri rrk rrp rrr