-ol c-- ccc ccd cce ccf ccl cco cct cdc cdd cde cdf cdl cdo cdt ce- cec ced cee cef cel ceo cet cfc cfd cfe cff cfl cfo cft cl- clc cld cle clf cll clo clt co- coc cod coe cof col coo cot ctc ctd cte ctf ctl cto ctt dcc dcd dce dcf dcl dco dct ddc ddd dde ddf ddl ddo ddt de- dec ded dee def del deo det dfc dfd dfe dff dfl dfo dft dl- dlc dld dle dlf dll dlo dlt doc dod doe dof dol doo dot dtc dtd dte dtf dtl dto dtt ec- ecc ecd ece ecf ecl eco ect ed- edc edd ede edf edl edo edt eec eed eee eef eel eeo eet ef- efc efd efe eff efl efo eft elc eld ele elf ell elo elt eo- eoc eod eoe eof eol eoo eot etc etd ete etf etl eto ett fcc fcd fce fcf fcl fco fct fdc fdd fde fdf fdl fdo fdt fec fed fee fef fel feo fet ffc ffd ffe fff ffl ffo fft flc fld fle flf fll flo flt foc foe fof fol foo fot ftc ftd fte ftf ftl fto ftt lcc lcd lce lcf lcl lco lct ldc ldd lde ldf ldl ldo ldt lec led lee lef lel leo let lfc lfd lfe lff lfl lfo lft llc lld lle llf lll llo llt loc lod loe lof lol loo lot ltc ltd lte ltf ltl lto ltt oc- occ ocd ocf ocl oco oct odc odd ode odf odl odo odt oec oed oee oef oel oeo oet of- ofc ofd ofe off ofl ofo oft olc old ole olf oll olo olt oo- ooc ood oof ool ooo oot ot- otc otd ote otf otl oto ott tcc tcd tce tcf tcl tco tct tdc tdd tde tdf tdl tdo tdt te- tec ted tee tef tel teo tet tfc tfd tfe tff tfl tfo tft tlc tld tle tlf tll tlo tlt to- toc tod toe tof tol too tot ttc ttd tte ttf ttl tto ttt