-ol b-u bbb bbc bbd bbl bbo bbr bbu bcb bcc bcd bcl bco bcr bcu bdb bdc bdd bdl bdo bdr bdu blb blc bld bll blo blr blu bob boc bod bol boo bor bou brb brd brl bro brr bru bub buc bud bul buo bur buu c-- cbb cbc cbd cbl cbo cbr cbu ccb ccc ccd ccl cco ccr ccu cdb cdc cdd cdl cdo cdr cdu cl- clb clc cld cll clo clr clu co- cob coc cod col coo cor cou crb crc crd crl cro crr cru cub cuc cud cul cuo cur cuu dbb dbc dbd dbl dbo dbr dbu dcb dcc dcd dcl dco dcr dcu ddb ddc ddd ddl ddo ddr ddu dl- dlb dlc dld dll dlo dlr dlu dob doc dod dol doo dor dou drb drc drd drl dro drr dru dub duc dud dul duo dur lbb lbc lbd lbl lbo lbr lbu lcb lcc lcd lcl lco lcr lcu ldb ldc ldd ldl ldo ldr ldu llb llc lld lll llo llr llu lob loc lod lol loo lor lou lrb lrc lrd lro lrr lru lub luc lud lul luo lur luu ob- obb obc obd obl obo obr obu oc- ocb occ ocd ocl oco ocr ocu odb odc odd odl odo odr odu olb olc old oll olo olu oo- oob ooc ood ool ooo oor or- orb orc ord orl oro orr oru ou- ouc oud oul ouo our rbb rbc rbd rbl rbo rbr rbu rcb rcc rcd rcl rco rcr rcu rdb rdc rdd rdl rdo rdr rdu rlc rld rll rlo rlr rlu rob roc rod rol roo ror rou rrb rrc rrd rrl rrr rru rub ruc rud ruo rur ruu ubb ubc ubl ubo ubr ubu ucb ucc ucd ucl uco ucr ucu udb udc udd udl udo udr udu ulb ulc uld ull ulo ulr ulu uob uoc uod uol uoo uor ur- urb urc urd url uro urr uru uuc uur uuu