bbbb bbin bbpr bibb bibi biin bin- bini binn biny binz bipp birb biri birn birr biry bizz bnib bnin bnpp bnrr brin briz brrr bry- bryn byrn bzip bzyb bzzz i-by ibri ibyi iiii inby inni innr inny inp- inpi inpp inri ipin ippr ippy ipri irbp irby iri- irin irip iriy irri iryn izby izzy n-ii nbpp nibi niip niir nini nipr niyi nizy nnnn nnpi nnpr npin npri nrpn nyny nyrb nzpi nzpp nzrb pibb pibi piip pini pinn pinp piny pipi pipp pipy piri pirn pirr piry pizy pnin pnpp ppib pppn pppp pri- prii prin prnp prri pyin pyn- pypy pyr- pyri pyry pyzy rbbb rbbr rib- riby riin rinn riny ripi ripp ripr riri rizi rizz rnbr rnin rpii rppn rrrr rybp ryip rynn rzip ybry yinz yirb yirn yirr ypir yrin yryn yyyy ziip zinn zipp ziri zirp ziyi zizi zizz zrin zypp zyyi zzzz