-ol c-- ccc ccd cck ccl cco ccr cdc cdd cdk cdl cdo cdr ckc ckd cko cl- clc cld clk cll clo clr co- coc cod cok col coo cor crc crd crk crl cro crr dcc dcd dck dcl dco dcr ddc ddd ddk ddl ddo ddr dkc dkk dkl dko dkr dl- dlc dld dlk dll dlo dlr doc dod dok dol doo dor drc drd drk drl dro drr kcc kcd kck kcl kcr kdc kdk kdl kdo kdr kkc kkk kkl kkr kl- klc kld klo klr koc kod kok kol koo kor krc krd krk krl kro krr lcc lcd lck lcl lco lcr ldc ldd ldk ldl ldo ldr lkl lkr llc lld llk lll llo llr loc lod lok lol loo lor lrc lrd lrk lro lrr oc- occ ocd ock ocl oco ocr odc odd odl odo odr okc okd okk okl oko okr olc old olk oll olo oo- ooc ood ook ool ooo oor or- orc ord ork orl oro orr rcc rcd rcl rco rcr rdc rdd rdl rdo rdr rkc rkk rko rlc rld rll rlo rlr roc rod rok rol roo ror rrc rrd rrk rrl rrr