a-a a-b aaa aab aad aak aar aav ab- aba abb abd abk abr abv ad- ada adb add adk adr adv aka akb akd akk akr akv ar- ara arb ard ark arr arv av- ava avb avd avk avr baa bab bad bak bar bav bba bbb bbd bbk bbr bda bdb bdd bdk bdr bdv bka bkb bkk bkr bkv bra brb brd brk brr brv bva bvb bvd bvk bvr bvv daa dab dad dak dar dav dba dbb dbd dbk dbr dbv dda ddb ddd ddk ddr dka dkb dkk dkr dra drb drd drk drr drv dva dvb dvd dvk dvr ka- kaa kab kad kak kar kav kba kbb kbd kbk kbr kda kdb kdk kdr kkb kkk kkr kkv kra krd krk krr krv kva kvb kvk kvr kvv ra- raa rab rad rak rar rav rba rbb rbd rbk rbr rda rdb rdd rdr rdv rkb rkk rkv rra rrb rrd rrk rrr rva rvb rvd rvr rvv v-a vaa vab vad vak var vav vba vbd vbk vbr vbv vdb vdd vdk vdr vdv vka vkb vra vrb vrd vrk vrr vva vvb vvr vvv