-ol bbb bbc bbd bbk bbl bbo bbr bcb bcc bcd bck bcl bco bcr bcz bdb bdc bdd bdk bdl bdo bdr bdz bkb bkc bkk bkl bko bkr blb blc bld blk bll blo blr blz bob boc bod bok bol boo bor boz brb brd brk brl bro brr brz bzd bzo bzr bzz c-- cbb cbc cbd cbk cbl cbo cbr cbz ccb ccc ccd cck ccl cco ccr ccz cdb cdc cdd cdk cdl cdo cdr cdz ckb ckc ckd cko cl- clb clc cld clk cll clo clr clz co- cob coc cod cok col coo cor coz crb crc crd crk crl cro crr crz cz- czc czd czk czo dbb dbc dbd dbk dbl dbo dbr dbz dcb dcc dcd dck dcl dco dcr ddb ddc ddd ddk ddl ddo ddr ddz dkb dkc dkk dkl dko dkr dl- dlb dlc dld dlk dll dlo dlr dob doc dod dok dol doo dor doz drb drc drd drk drl dro drr drz dzb dzd dzo dzr k-z kbb kbc kbd kbk kbl kbo kbr kbz kcb kcc kcd kck kcl kcr kdb kdc kdk kdl kdo kdr kkb kkc kkk kkl kkr kl- klb klc kld klo klr klz kob koc kod kok kol koo kor koz krc krd krk krl kro krr kzo lbb lbc lbd lbk lbl lbo lbr lcb lcc lcd lck lcl lco lcr ldb ldc ldd ldk ldl ldo ldr lkb lkl lkr llb llc lld llk lll llo llr llz lob loc lod lok lol loo lor loz lrb lrc lrd lrk lro lrr lrz lzo lzr ob- obb obc obd obk obl obo obr oc- ocb occ ocd ock ocl oco ocr ocz odb odc odd odl odo odr okb okc okd okk okl oko okr olb olc old olk oll olo oo- oob ooc ood ook ool ooo oor or- orb orc ord ork orl oro orr orz ozo ozz rbb rbc rbd rbk rbl rbo rbr rcb rcc rcd rcl rco rcr rdb rdc rdd rdl rdo rdr rkb rkc rkk rko rkz rlc rld rll rlo rlr rob roc rod rok rol roo ror roz rrb rrc rrd rrk rrl rrr rzb rzo zbb zbc zbl zbr zcl zco zlr zo- zob zoc zod zok zol zoo zor zrl zro zzr zzz