-ic bbb bbc bbi bbo bbr bbs bcb bcc bci bco bcr bcs bcz bi- bib bic bii bio bir bis biz bob boc boi boo bor bos boz brb bri bro brr brs brz bsb bsc bsi bso bsr bss bzo bzr bzs bzz c-- cbb cbc cbi cbo cbr cbs cbz ccb ccc cci cco ccr ccs ccz ci- cib cic cii cio cir cis co- cob coc coi coo cor cos coz crb crc cri cro crr crs crz csb csc csi cso csr css csz cz- czc czo ibb ibc ibi ibo ibr ibs ibz icb icc ici ico icr ics icz iib iic iii iio iir iis io- iob ioc ioi ioo ior ios ir- irb irc iri iro irr irs is- isb isc isi iso isr iss izi izo izz o-i ob- obb obc obi obo obr obs oc- ocb occ oci oco ocr ocs ocz oib oic oii oio oir ois oiz oo- oob ooc ooi ooo oor oos or- orb orc ori oro orr ors orz os- osb osc osi oso osr oss ozo ozs ozz rbb rbc rbi rbo rbr rbs rcb rcc rci rco rcr rcs rib ric rii rio rir ris riz rob roc roi roo ror ros roz rrb rrc rri rrr rrs rsb rsc rsi rso rsr rss rzb rzo sbb sbc sbi sbo sbr sbs scb scc sci sco scr scs sib sic sii sio sir sis sob soc soi soo sor sos soz sr- srb src sri sro srr srs ss- ssb ssc ssi sso ssr sss ssz szi szr zbb zbc zbr zbs zco zcs zib zio zir zis ziz zo- zob zoc zoi zoo zor zos zro zrs zsi zsz zzr zzs zzz