-ic -ol bbb bbc bbi bbl bbo bbr bbt bcb bcc bci bcl bco bcr bct bi- bib bic bii bil bio bir bit blb blc bli bll blo blr blt bob boc boi bol boo bor bot brb bri brl bro brr brt btb btc bti btl bto btr btt c-- cbb cbc cbi cbl cbo cbr cbt ccb ccc cci ccl cco ccr cct ci- cib cic cii cil cio cir cit cl- clb clc cli cll clo clr clt co- cob coc coi col coo cor cot crb crc cri crl cro crr crt ctb ctc cti ctl cto ctr ctt ibb ibc ibi ibl ibo ibr ibt icb icc ici icl ico icr ict iib iic iii iil iio iir iit il- ilb ilc ili ill ilo ilr ilt io- iob ioc ioi iol ioo ior iot ir- irb irc iri irl iro irr irt itb itc iti itl ito itt lbb lbc lbi lbl lbo lbr lbt lcb lcc lci lcl lco lcr lct lib lic lii lil lio lir lit llb llc lli lll llo llr llt lob loc loi lol loo lor lot lrb lrc lri lro lrr lrt ltb ltc lti ltl lto ltr ltt o-i ob- obb obc obi obl obo obr obt oc- ocb occ oci ocl oco ocr oct oib oic oii oil oio oir oit olb olc oli oll olo olt oo- oob ooc ooi ool ooo oor oot or- orb orc ori orl oro orr ort ot- otb otc oti otl oto otr ott rbb rbc rbi rbl rbo rbr rbt rcb rcc rci rcl rco rcr rct rib ric rii ril rio rir rit rlc rli rll rlo rlr rlt rob roc roi rol roo ror rot rrb rrc rri rrl rrr rrt rtb rtc rti rtl rto rtr rtt tbb tbc tbi tbl tbo tbr tbt tcb tcc tci tcl tco tcr tct tib tic tii til tio tir tit tlc tli tll tlo tlr tlt to- tob toc toi tol too tor tot trb trc tri trl tro trr trt ttb ttc tti ttl tto ttr ttt