-ic bbb bbc bbi bbm bbo bbr bbt bbx bcb bcc bci bcm bco bcr bct bcx bi- bib bic bii bim bio bir bit bix bmb bmc bmi bmm bmo bmr bmt bmx bob boc boi bom boo bor bot box brb bri brm bro brr brt brx btb btc bti btm bto btr btt btx bxb bxi bxm bxo bxx c-- cbb cbc cbi cbm cbo cbr cbt cbx ccb ccc cci ccm cco ccr cct ccx ci- cib cic cii cim cio cir cit cix cmb cmc cmi cmm cmo cmr cmt cmx co- cob coc coi com coo cor cot cox crb crc cri crm cro crr crt crx ctb ctc cti ctm cto ctr ctt ctx cxc cxi cxo cxr cxt cxx ibb ibc ibi ibm ibo ibr ibt ibx icb icc ici icm ico icr ict iib iic iii iim iio iir iit iix im- imb imc imi imm imo imt imx io- iob ioc ioi iom ioo ior iot ir- irb irc iri irm iro irr irt irx itb itc iti itm ito itt itx ixc ixi m-o m-r mbb mbc mbi mbm mbo mbr mbt mbx mc- mcb mcc mci mcm mco mcr mct mcx mi- mib mic mii mim mio mir mit mix mmb mmc mmi mmm mmo mmr mmt mmx mob moc moi mom moo mor mot mox mrb mrc mri mrm mro mrr mrt mrx mtb mtc mti mtm mto mtr mtt mtx mxc mxi mxr o-i ob- obb obc obi obm obo obr obt obx oc- ocb occ oci ocm oco ocr oct ocx oib oic oii oim oio oir oit om- omb omc omi omm omo omr omt omx oo- oob ooc ooi oom ooo oor oot oox or- orb orc ori orm oro orr ort orx ot- otb otc oti otm oto otr ott ox- oxb oxc oxi oxo oxt oxx rbb rbc rbi rbm rbo rbr rbt rbx rcb rcc rci rcm rco rcr rct rcx rib ric rii rim rio rir rit rix rmb rmc rmi rmm rmo rmr rmt rmx rob roc roi rom roo ror rot rox rrb rrc rri rrm rrr rrt rtb rtc rti rtm rto rtr rtt rtx rxr t-x tbb tbc tbi tbm tbo tbr tbt tcb tcc tci tcm tco tcr tct tcx tib tic tii tim tio tir tit tix tmb tmc tmi tmm tmo tmr tmt tmx to- tob toc toi tom too tor tot tox trb trc tri trm tro trr trt trx ttb ttc tti ttm tto ttr ttt ttx txi txt xbc xbr xbx xcb xci xcr xcx xic xii xio xit xix xmc xmi xmm xmo xmr xmt xmx xoc xoi xom xoo xor xot xox xrc xrt xrx xtc xti xtm xtr xtx xxi xxo xxx