a-a a-b a-i a-t aaa aab aad aai aap aar aat ab- aba abb abd abi abp abr abt ad- ada adb add adi adp adr adt ai- aia aib aid aii aip air ait ap- apa apb apd api app apr apt ar- ara arb ard ari arp arr art at- ata atb atd ati atp atr att b-p baa bab bad bai bap bar bat bba bbb bbd bbi bbp bbr bbt bda bdb bdd bdi bdp bdr bdt bi- bia bib bid bii bip bir bit bpa bpb bpd bpi bpp bpr bpt bra brb brd bri brp brr brt bta btb btd bti btp btr btt daa dab dad dai dap dar dat dba dbb dbd dbi dbp dbr dbt dda ddb ddd ddi ddp ddr ddt di- dia dib did dii dip dir dit dpa dpb dpd dpi dpp dpr dpt dra drb drd dri drp drr drt dta dtb dtd dti dtp dtr dtt i-d ia- iaa iab iad iai iap iar iat iba ibb ibd ibi ibp ibr ibt ida idb idd idi idp idr idt iia iib iid iii iip iir iit ipa ipb ipd ipi ipp ipr ipt ir- ira irb ird iri irp irr irt ita itb itd iti itp itt p-p paa pab pad pai pap par pat pba pbb pbd pbi pbp pbr pbt pda pdb pdd pdi pdp pdr pdt pia pib pid pii pip pir pit ppa ppb ppd ppi ppp ppr ppt pra prb prd pri prp prr prt pt- pta ptb ptd pti ptp ptr ptt ra- raa rab rad rai rap rar rat rba rbb rbd rbi rbp rbr rbt rda rdb rdd rdi rdp rdr rdt ria rib rid rii rip rir rit rpa rpb rpd rpi rpp rpr rpt rra rrb rrd rri rrp rrr rrt rta rtb rtd rti rtp rtr rtt taa tab tad tai tap tar tat tba tbb tbd tbi tbp tbr tbt tda tdb tdd tdi tdp tdr tdt tia tib tid tii tip tir tit tpa tpb tpd tpi tpp tpr tpt tra trb trd tri trp trr trt tta ttb ttd tti ttp ttr ttt