a-a a-b a-q aaa aab aad aaq aar ab- aba abb abd abq abr ad- ada adb add adq adr aqa aqr ar- ara arb ard arq arr baa bab bad baq bar bba bbb bbd bbq bbr bda bdb bdd bdq bdr bqd bra brb brd brq brr daa dab dad daq dar dba dbb dbd dbq dbr dda ddb ddd ddq ddr dqa dra drb drd drq drr qaa qad qar qba qbd qbq qda qdb qdr qqq qra qrb ra- raa rab rad raq rar rba rbb rbd rbr rda rdb rdd rdr rra rrb rrd rrq rrr