-ic bbb bbc bbh bbi bbo bbr bbs bcb bcc bch bci bco bcr bcs bhb bhc bhh bhi bho bhr bhs bi- bib bic bih bii bio bir bis bob boc boh boi boo bor bos brb brh bri bro brr brs bsb bsc bsh bsi bso bsr bss c-- cbb cbc cbh cbi cbo cbr cbs ccb ccc cch cci cco ccr ccs ch- chb chc chh chi cho chr chs ci- cib cic cih cii cio cir cis co- cob coc coh coi coo cor cos crb crc crh cri cro crr crs csb csc csh csi cso csr css h-i hbb hbc hbh hbi hbo hbr hbs hcb hcc hch hci hco hcr hcs hhb hhc hhh hhi hho hhr hhs hib hic hih hii hio hir his hob hoc hoh hoi hoo hor hos hr- hrb hrc hrh hri hro hrr hrs hsb hsc hsh hsi hsr hss ibb ibc ibh ibi ibo ibr ibs icb icc ich ici ico icr ics ihb ihc ihh ihi iho ihr ihs iib iic iih iii iio iir iis io- iob ioc ioh ioi ioo ior ios ir- irb irc iri iro irr irs is- isb isc ish isi iso isr iss o-i ob- obb obc obh obi obo obr obs oc- ocb occ och oci oco ocr ocs ohc ohh ohi oho ohr ohs oib oic oii oio oir ois oo- oob ooc ooh ooi ooo oor oos or- orb orc orh ori oro orr ors os- osb osc osh osi oso osr oss rbb rbc rbh rbi rbo rbr rbs rcb rcc rch rci rco rcr rcs rh- rhb rhc rhh rhi rho rhr rhs rib ric rih rii rio rir ris rob roc roh roi roo ror ros rrb rrc rrh rri rrr rrs rsb rsc rsh rsi rso rsr rss sbb sbc sbh sbi sbo sbr sbs scb scc sch sci sco scr scs sh- shb shc shh shi sho shr shs sib sic sih sii sio sir sis sob soc soh soi soo sor sos sr- srb src srh sri sro srr srs ss- ssb ssc ssh ssi sso ssr sss