-ic bbb bbc bbf bbi bbm bbo bbr bbs bcb bcc bcf bci bcm bco bcr bcs bfb bfc bff bfi bfm bfo bfr bfs bi- bib bic bif bii bim bio bir bis bmb bmc bmf bmi bmm bmo bmr bms bob boc bof boi bom boo bor bos brb brf bri brm bro brr brs bsb bsc bsf bsi bsm bso bsr bss c-- cbb cbc cbf cbi cbm cbo cbr cbs ccb ccc ccf cci ccm cco ccr ccs cfb cfc cff cfi cfm cfo cfr cfs ci- cib cic cif cii cim cio cir cis cmb cmc cmf cmi cmm cmo cmr cms co- cob coc cof coi com coo cor cos crb crc crf cri crm cro crr crs csb csc csf csi csm cso csr css fbb fbc fbf fbi fbm fbo fbr fbs fcb fcc fcf fci fcm fco fcr fcs ffc fff ffi ffm ffo ffr ffs fib fic fif fii fim fir fis fmb fmc fmf fmi fmm fmo fmr fms fob foc fof foi fom foo for fos frb frc frf fri frm fro frr frs fsb fsc fsf fsi fsm fso fsr fss i-f ibb ibc ibf ibi ibm ibo ibr ibs icb icc icf ici icm ico icr ics ifb ifc iff ifi ifm ifo ifr ifs iib iic iif iii iim iio iir iis im- imb imc imf imi imm imo ims io- iob ioc iof ioi iom ioo ior ios ir- irb irc irf iri irm iro irr irs is- isb isc isf isi ism iso isr iss m-f m-o m-r mbb mbc mbf mbi mbm mbo mbr mbs mc- mcb mcc mcf mci mcm mco mcr mcs mfb mfc mff mfi mfm mfo mfr mfs mi- mib mic mif mii mim mio mir mis mmb mmc mmf mmi mmm mmo mmr mms mob moc mof moi mom moo mor mos mrb mrc mrf mri mrm mro mrr mrs msb msc msf msi msm mso msr mss o-i ob- obb obc obf obi obm obo obr obs oc- ocb occ ocf oci ocm oco ocr ocs of- ofb ofc off ofi ofm ofo ofr ofs oib oic oif oii oim oio oir ois om- omb omc omf omi omm omo omr oms oo- oob ooc oof ooi oom ooo oor oos or- orb orc orf ori orm oro orr ors os- osb osc osf osi osm oso osr oss rbb rbc rbf rbi rbm rbo rbr rbs rcb rcc rcf rci rcm rco rcr rcs rfb rfc rff rfi rfm rfo rfr rfs rib ric rif rii rim rio rir ris rmb rmc rmf rmi rmm rmo rmr rms rob roc rof roi rom roo ror ros rrb rrc rrf rri rrm rrr rrs rsb rsc rsf rsi rsm rso rsr rss sbb sbc sbf sbi sbm sbo sbr sbs scb scc scf sci scm sco scr scs sfb sfc sff sfi sfm sfo sfr sfs sib sic sif sii sim sio sir sis smb smc smf smi smm smo smr sms sob soc sof soi som soo sor sos sr- srb src srf sri srm sro srr srs ss- ssb ssc ssf ssi ssm sso ssr sss