-ic -ol bbb bbc bbi bbl bbo bbs bbt bcb bcc bci bcl bco bcs bct bi- bib bic bii bil bio bis bit blb blc bli bll blo bls blt bob boc boi bol boo bos bot bsb bsc bsi bsl bso bss bst btb btc bti btl bto bts btt c-- cbb cbc cbi cbl cbo cbs cbt ccb ccc cci ccl cco ccs cct ci- cib cic cii cil cio cis cit cl- clb clc cli cll clo cls clt co- cob coc coi col coo cos cot csb csc csi csl cso css cst ctb ctc cti ctl cto cts ctt ibb ibc ibi ibl ibo ibs ibt icb icc ici icl ico ics ict iib iic iii iil iio iis iit il- ilb ilc ili ill ilo ils ilt io- iob ioc ioi iol ioo ios iot is- isb isc isi isl iso iss ist itb itc iti itl ito its itt lbb lbc lbi lbl lbo lbs lbt lcb lcc lci lcl lco lcs lct lib lic lii lil lio lis lit llb llc lli lll llo lls llt lob loc loi lol loo los lot lsb lsc lsi lsl lso lss lst ltb ltc lti ltl lto lts ltt o-i ob- obb obc obi obl obo obs obt oc- ocb occ oci ocl oco ocs oct oib oic oii oil oio ois oit olb olc oli oll olo ols olt oo- oob ooc ooi ool ooo oos oot os- osb osc osi osl oso oss ost ot- otb otc oti otl oto ots ott sbb sbc sbi sbl sbo sbs sbt scb scc sci scl sco scs sct sib sic sii sil sio sis sit slb slc sli sll slo sls slt sob soc soi sol soo sos sot ss- ssb ssc ssi ssl sso sss sst stb stc sti stl sto sts stt tbb tbc tbi tbl tbo tbs tbt tcb tcc tci tcl tco tcs tct tib tic tii til tio tis tit tlc tli tll tlo tls tlt to- tob toc toi tol too tos tot tsb tsc tsi tsl tso tss tst ttb ttc tti ttl tto tts ttt