bbbb bbbs bnor bnrr bnss bobb bobo bobs bonn bono bons boob boon boor boos booz bor- born boro borr bors borz bosn boso boss bozo brno brns brob bron broo bror bros broz brrr brrs brsb brsr bsns bson bsos bzzz nbbo nnnn nnos nnss nobo nobs non- nonn nono nons noo- noob noon nooo noor noos nor- norb norn noro norr nors nos- noss nron nsbo nsnr nsos nssb nsso nssr nsss nzrb obbo obon obor obos obro obsn obsr obss onno onon onor onos onoz onso onzo oons oooo ooos orbb orbo orbs orno orns oro- oron oror oros oroz orro orrs orso orzo osno osnr osoo osor osos osro ossb osso ozon rbbb rbbr rbbs rbss rnbr rob- robb robo robs rono rons roob roon roor roos rooz roro roso ross rozz rrrr rsnn rsno rsnr rsos s-os sbbs sbor snns snob snoo snor snos snrs sobo sobr sobs son- sono sons soon soor soos sorb sorn soro sorr sors soso soss soz- srnn srno sros ssbn ssbr ssns ssrs sssb ssss szob szss z-ro zobo zon- zons zoo- zoon zoos zorb zorn zoro zors zoso zoss zozo zsss zzzs zzzz