a-a a-b aaa aab aak aam aan aar ab- aba abb abk abm abn abr aka akb akk akm akn akr ama amb amk amm amn amr an- ana anb ank anm ann anr ar- ara arb ark arm arn arr baa bab bak bam ban bar bba bbb bbk bbm bbn bbr bka bkb bkk bkm bkn bkr bma bmb bmk bmm bmn bmr bna bnb bnk bnn bnr bra brb brk brm brn brr ka- kaa kab kak kam kan kar kba kbb kbk kbm kbn kbr kkb kkk kkm kkn kkr kma kmb kmk kmm kn- kna knk knm knn knr kra krk krn krr m-r maa mab mak mam man mar mba mbb mbk mbm mbr mka mkb mkk mkm mkn mkr mma mmb mmk mmm mmn mmr mna mnb mnk mnm mnn mnr mra mrb mrk mrm mrn mrr naa nab nak nam nan nar nba nbb nbk nbm nbn nbr nka nkk nkm nkn nkr nma nmb nmk nmm nmn nmr nna nnb nnk nnm nnn nra nrb nrk nrm nrn nrr ra- raa rab rak ram ran rar rba rbb rbk rbm rbn rbr rkb rkk rkm rma rmb rmm rmn rmr rna rnb rnm rnn rnr rra rrb rrk rrm rrn rrr