-ic bbb bbc bbf bbi bbo bbr bbs bbt bcb bcc bcf bci bco bcr bcs bct bfb bfc bff bfi bfo bfr bfs bft bi- bib bic bif bii bio bir bis bit bob boc bof boi boo bor bos bot brb brf bri bro brr brs brt bsb bsc bsf bsi bso bsr bss bst btb btc btf bti bto btr bts btt c-- cbb cbc cbf cbi cbo cbr cbs cbt ccb ccc ccf cci cco ccr ccs cct cfb cfc cff cfi cfo cfr cfs cft ci- cib cic cif cii cio cir cis cit co- cob coc cof coi coo cor cos cot crb crc crf cri cro crr crs crt csb csc csf csi cso csr css cst ctb ctc ctf cti cto ctr cts ctt fbb fbc fbf fbi fbo fbr fbs fbt fcb fcc fcf fci fco fcr fcs fct ffc fff ffi ffo ffr ffs fft fib fic fif fii fir fis fit fob foc fof foi foo for fos fot frb frc frf fri fro frr frs frt fsb fsc fsf fsi fso fsr fss fst ftb ftc ftf fti fto ftr fts ftt i-f ibb ibc ibf ibi ibo ibr ibs ibt icb icc icf ici ico icr ics ict ifb ifc iff ifi ifo ifr ifs ift iib iic iif iii iio iir iis iit io- iob ioc iof ioi ioo ior ios iot ir- irb irc irf iri iro irr irs irt is- isb isc isf isi iso isr iss ist itb itc itf iti ito its itt o-i ob- obb obc obf obi obo obr obs obt oc- ocb occ ocf oci oco ocr ocs oct of- ofb ofc off ofi ofo ofr ofs oft oib oic oif oii oio oir ois oit oo- oob ooc oof ooi ooo oor oos oot or- orb orc orf ori oro orr ors ort os- osb osc osf osi oso osr oss ost ot- otb otc otf oti oto otr ots ott rbb rbc rbf rbi rbo rbr rbs rbt rcb rcc rcf rci rco rcr rcs rct rfb rfc rff rfi rfo rfr rfs rft rib ric rif rii rio rir ris rit rob roc rof roi roo ror ros rot rrb rrc rrf rri rrr rrs rrt rsb rsc rsf rsi rso rsr rss rst rtb rtc rtf rti rto rtr rts rtt sbb sbc sbf sbi sbo sbr sbs sbt scb scc scf sci sco scr scs sct sfb sfc sff sfi sfo sfr sfs sft sib sic sif sii sio sir sis sit sob soc sof soi soo sor sos sot sr- srb src srf sri sro srr srs srt ss- ssb ssc ssf ssi sso ssr sss sst stb stc stf sti sto str sts stt tbb tbc tbf tbi tbo tbr tbs tbt tcb tcc tcf tci tco tcr tcs tct tfb tfc tff tfi tfo tfr tfs tft tib tic tif tii tio tir tis tit to- tob toc tof toi too tor tos tot trb trc trf tri tro trr trs trt tsb tsc tsf tsi tso tsr tss tst ttb ttc ttf tti tto ttr tts ttt