a-a a-b aaa aab aad aak aap aar ab- aba abb abd abk abp abr ad- ada adb add adk adp adr aka akb akd akk akp akr ap- apa apb apd apk app apr ar- ara arb ard ark arp arr b-p baa bab bad bak bap bar bba bbb bbd bbk bbp bbr bda bdb bdd bdk bdp bdr bka bkb bkk bkp bkr bpa bpb bpd bpp bpr bra brb brd brk brp brr daa dab dad dak dap dar dba dbb dbd dbk dbp dbr dda ddb ddd ddk ddp ddr dka dkb dkk dkp dkr dpa dpb dpd dpk dpp dpr dra drb drd drk drp drr ka- kaa kab kad kak kap kar kba kbb kbd kbk kbp kbr kda kdb kdk kdp kdr kkb kkk kkp kkr kpa kpd kpk kpp kpr kra krd krk krp krr p-p paa pab pad pak pap par pba pbb pbd pbk pbp pbr pda pdb pdd pdk pdp pdr pka pkb pkd pkp pkr ppa ppb ppd ppk ppp ppr pra prb prd prk prp prr ra- raa rab rad rak rap rar rba rbb rbd rbk rbp rbr rda rdb rdd rdp rdr rkb rkk rkp rpa rpb rpd rpk rpp rpr rra rrb rrd rrk rrp rrr