-ic bbb bbc bbi bbm bbo bbs bbt bby bcb bcc bci bcm bco bcs bct bcy bi- bib bic bii bim bio bis bit biy bmb bmc bmi bmm bmo bms bmt bob boc boi bom boo bos bot boy bsb bsc bsi bsm bso bss bst bsy btb btc bti btm bto bts btt bty by- byc byi bym byo bys byt c-- cbb cbc cbi cbm cbo cbs cbt cby ccb ccc cci ccm cco ccs cct ci- cib cic cii cim cio cis cit cmb cmc cmi cmm cmo cms cmt cmy co- cob coc coi com coo cos cot coy csb csc csi csm cso css cst csy ctb ctc cti ctm cto cts ctt cty cyb cyc cym cyo cys cyt ibb ibc ibi ibm ibo ibs ibt iby icb icc ici icm ico ics ict icy iib iic iii iim iio iis iit im- imb imc imi imm imo ims imt imy io- iob ioc ioi iom ioo ios iot is- isb isc isi ism iso iss ist isy itb itc iti itm ito its itt ity iyc iym iyo iys iyt iyy m-o mbb mbc mbi mbm mbo mbs mbt mc- mcb mcc mci mcm mco mcs mct mi- mib mic mii mim mio mis mit miy mmb mmc mmi mmm mmo mms mmt mob moc moi mom moo mos mot moy msb msc msi msm mso mss mst msy mtb mtc mti mtm mto mts mtt my- myb myc mym myo mys myt o-i ob- obb obc obi obm obo obs obt oby oc- ocb occ oci ocm oco ocs oct oib oic oii oim oio ois oit om- omb omc omi omm omo oms omt omy oo- oob ooc ooi oom ooo oos oot os- osb osc osi osm oso oss ost ot- otb otc oti otm oto ots ott oyi oyo oys sbb sbc sbi sbm sbo sbs sbt sby scb scc sci scm sco scs sct sib sic sii sim sio sis sit smb smc smi smm smo sms smt smy sob soc soi som soo sos sot soy ss- ssb ssc ssi ssm sso sss sst stb stc sti stm sto sts stt sty sy- syb syc syi sym sys syt tbb tbc tbi tbm tbo tbs tbt tcb tcc tci tcm tco tcs tct tib tic tii tim tio tis tit tiy tmb tmc tmi tmm tmo tms tmt tmy to- tob toc toi tom too tos tot toy tsb tsc tsi tsm tso tss tst tsy ttb ttc tti ttm tto tts ttt tty tyc tym tyo tys tyt ybc ybi ybm ybs yby ycc yci yco ycs ycy yii yim yio yis yit ymc ymi ymm ymo yms ymt yob yoc yoi yom yoo yos yot yoy ysb ysc ysi ysm yso yss yst ysy ytc ytm yto yts ytt yyb yyc yys yyt yyy