bbb bbk bbn bbr bbs bby bkb bkk bkn bkr bks bnb bnk bnn bnr bns brb brk brn brr brs bry bsb bsk bsn bsr bss bsy by- byk byn byr bys kbb kbk kbn kbr kbs kkb kkk kkn kkr kks kky kn- knk knn knr krk krn krr krs kry ksb ksk ksn ksr kss kyn kyr kys nbb nbk nbn nbr nbs nkk nkn nkr nks nky nnb nnk nnn nns nrb nrk nrn nrr nrs nry nsb nsk nsn nsr nss nsy nyk nyn nys nyy rbb rbk rbn rbr rbs rkb rkk rks rky rnb rnn rnr rns rny rrb rrk rrn rrr rrs rsb rsk rsn rsr rss ry- ryk ryn ryr rys ryy sbb sbk sbn sbr sbs sby sk- skb skk skr sks sky snb snk snn snr sns sny sr- srb srk srn srr srs sry ss- ssb ssk ssn ssr sss sy- syb syk syn syr sys ybr ybs yby ykk ykn ynk ynn yns yny yrn yrs ysb ysk ysr yss ysy yyb yys yyy