-al -ol a-a a-c aaa aac aaf aal aao aas ac- aca acc acf acl aco acs af- afa afc aff afl afo afs al- ala alc alf all alo als aoa aoc aof aol aoo aos as- asa asc asf asl aso ass c-- caa cac caf cal cao cas cca ccc ccf ccl cco ccs cfa cfc cff cfl cfo cfs cl- cla clc clf cll clo cls co- coa coc cof col coo cos csa csc csf csl cso css faa fac faf fal fao fas fca fcc fcf fcl fco fcs ffa ffc fff ffl ffo ffs fla flc flf fll flo fls foa foc fof fol foo fos fsa fsc fsf fsl fso fss la- laa lac laf lal lao las lca lcc lcf lcl lco lcs lfa lfc lff lfl lfo lfs lla llc llf lll llo lls loa loc lof lol loo los lsa lsc lsf lsl lso lss oaa oac oaf oal oao oas oc- oca occ ocf ocl oco ocs of- ofa ofc off ofl ofo ofs ola olc olf oll olo ols oo- ooa ooc oof ool ooo oos os- osa osc osf osl oso oss saa sac saf sal sao sas sca scc scf scl sco scs sfa sfc sff sfl sfo sfs sla slc slf sll slo sls soa soc sof sol soo sos ss- ssa ssc ssf ssl sso sss