bbb bbi bbo bbs bi- bib bii bio bis biz bob boi boo bos boz bsb bsi bso bss bzo bzs bzz ibb ibi ibo ibs ibz iib iii iio iis io- iob ioi ioo ios is- isb isi iso iss izi izo izz o-i ob- obb obi obo obs oib oii oio ois oiz oo- oob ooi ooo oos os- osb osi oso oss ozo ozs ozz sbb sbi sbo sbs sib sii sio sis sob soi soo sos soz ss- ssb ssi sso sss ssz szi zbb zbs zib zio zis ziz zo- zob zoi zoo zos zsi zsz zzs zzz