-ic -ol bbb bbc bbi bbl bbo bbt bcb bcc bci bcl bco bct bi- bib bic bii bil bio bit blb blc bli bll blo blt bob boc boi bol boo bot btb btc bti btl bto btt c-- cbb cbc cbi cbl cbo cbt ccb ccc cci ccl cco cct ci- cib cic cii cil cio cit cl- clb clc cli cll clo clt co- cob coc coi col coo cot ctb ctc cti ctl cto ctt ibb ibc ibi ibl ibo ibt icb icc ici icl ico ict iib iic iii iil iio iit il- ilb ilc ili ill ilo ilt io- iob ioc ioi iol ioo iot itb itc iti itl ito itt lbb lbc lbi lbl lbo lbt lcb lcc lci lcl lco lct lib lic lii lil lio lit llb llc lli lll llo llt lob loc loi lol loo lot ltb ltc lti ltl lto ltt o-i ob- obb obc obi obl obo obt oc- ocb occ oci ocl oco oct oib oic oii oil oio oit olb olc oli oll olo olt oo- oob ooc ooi ool ooo oot ot- otb otc oti otl oto ott tbb tbc tbi tbl tbo tbt tcb tcc tci tcl tco tct tib tic tii til tio tit tlc tli tll tlo tlt to- tob toc toi tol too tot ttb ttc tti ttl tto ttt