-ic -th bbb bbc bbh bbi bbo bbr bbs bbt bcb bcc bch bci bco bcr bcs bct bhb bhc bhh bhi bho bhr bhs bht bi- bib bic bih bii bio bir bis bit bob boc boh boi boo bor bos bot brb brh bri bro brr brs brt bsb bsc bsh bsi bso bsr bss bst btb btc bth bti bto btr bts btt c-- cbb cbc cbh cbi cbo cbr cbs cbt ccb ccc cch cci cco ccr ccs cct ch- chb chc chh chi cho chr chs cht ci- cib cic cih cii cio cir cis cit co- cob coc coh coi coo cor cos cot crb crc crh cri cro crr crs crt csb csc csh csi cso csr css cst ctb ctc cth cti cto ctr cts ctt h-i hbb hbc hbh hbi hbo hbr hbs hbt hcb hcc hch hci hco hcr hcs hct hhb hhc hhh hhi hho hhr hhs hht hib hic hih hii hio hir his hit hob hoc hoh hoi hoo hor hos hot hr- hrb hrc hrh hri hro hrr hrs hrt hsb hsc hsh hsi hsr hss hst htb htc hth hti hto htr hts htt ibb ibc ibh ibi ibo ibr ibs ibt icb icc ich ici ico icr ics ict ihb ihc ihh ihi iho ihr ihs iht iib iic iih iii iio iir iis iit io- iob ioc ioh ioi ioo ior ios iot ir- irb irc iri iro irr irs irt is- isb isc ish isi iso isr iss ist itb itc ith iti ito its itt o-i ob- obb obc obh obi obo obr obs obt oc- ocb occ och oci oco ocr ocs oct ohc ohh ohi oho ohr ohs oht oib oic oii oio oir ois oit oo- oob ooc ooh ooi ooo oor oos oot or- orb orc orh ori oro orr ors ort os- osb osc osh osi oso osr oss ost ot- otb otc oth oti oto otr ots ott rbb rbc rbh rbi rbo rbr rbs rbt rcb rcc rch rci rco rcr rcs rct rh- rhb rhc rhh rhi rho rhr rhs rht rib ric rih rii rio rir ris rit rob roc roh roi roo ror ros rot rrb rrc rrh rri rrr rrs rrt rsb rsc rsh rsi rso rsr rss rst rtb rtc rti rto rtr rts rtt sbb sbc sbh sbi sbo sbr sbs sbt scb scc sch sci sco scr scs sct sh- shb shc shh shi sho shr shs sht sib sic sih sii sio sir sis sit sob soc soh soi soo sor sos sot sr- srb src srh sri sro srr srs srt ss- ssb ssc ssh ssi sso ssr sss sst stb stc sth sti sto str sts stt tbb tbc tbh tbi tbo tbr tbs tbt tcb tcc tch tci tco tcr tcs tct th- thb thc thh thi tho thr ths tht tib tic tih tii tio tir tis tit to- tob toc toh toi too tor tos tot trb trc trh tri tro trr trs trt tsb tsc tsh tsi tso tsr tss tst ttb ttc tth tti tto ttr tts ttt