-al -ic -ol a-a a-b a-c a-i aaa aab aac aaf aai aal aao aas ab- aba abb abc abf abi abl abo abs ac- aca acb acc acf aci acl aco acs af- afa afb afc aff afi afl afo afs ai- aia aib aic aif aii ail aio ais al- ala alb alc alf ali all alo als aoa aob aoc aof aoi aol aoo aos as- asa asb asc asf asi asl aso ass baa bab bac baf bai bal bao bas bba bbb bbc bbf bbi bbl bbo bbs bca bcb bcc bcf bci bcl bco bcs bfa bfb bfc bff bfi bfl bfo bfs bi- bia bib bic bif bii bil bio bis bla blb blc blf bli bll blo bls boa bob boc bof boi bol boo bos bsa bsb bsc bsf bsi bsl bso bss c-- caa cab cac caf cai cal cao cas cba cbb cbc cbf cbi cbl cbo cbs cca ccb ccc ccf cci ccl cco ccs cfa cfb cfc cff cfi cfl cfo cfs ci- cia cib cic cif cii cil cio cis cl- cla clb clc clf cli cll clo cls co- coa cob coc cof coi col coo cos csa csb csc csf csi csl cso css faa fab fac faf fai fal fao fas fba fbb fbc fbf fbi fbl fbo fbs fca fcb fcc fcf fci fcl fco fcs ffa ffc fff ffi ffl ffo ffs fia fib fic fif fii fil fis fla flb flc flf fli fll flo fls foa fob foc fof foi fol foo fos fsa fsb fsc fsf fsi fsl fso fss i-f ia- iaa iab iac iaf iai ial iao ias iba ibb ibc ibf ibi ibl ibo ibs ica icb icc icf ici icl ico ics ifa ifb ifc iff ifi ifl ifo ifs iia iib iic iif iii iil iio iis il- ila ilb ilc ilf ili ill ilo ils io- ioa iob ioc iof ioi iol ioo ios is- isa isb isc isf isi isl iso iss la- laa lab lac laf lai lal lao las lba lbb lbc lbf lbi lbl lbo lbs lca lcb lcc lcf lci lcl lco lcs lfa lfb lfc lff lfi lfl lfo lfs lia lib lic lif lii lil lio lis lla llb llc llf lli lll llo lls loa lob loc lof loi lol loo los lsa lsb lsc lsf lsi lsl lso lss o-i oaa oab oac oaf oai oal oao oas ob- oba obb obc obf obi obl obo obs oc- oca ocb occ ocf oci ocl oco ocs of- ofa ofb ofc off ofi ofl ofo ofs oia oib oic oif oii oil oio ois ola olb olc olf oli oll olo ols oo- ooa oob ooc oof ooi ool ooo oos os- osa osb osc osf osi osl oso oss saa sab sac saf sai sal sao sas sba sbb sbc sbf sbi sbl sbo sbs sca scb scc scf sci scl sco scs sfa sfb sfc sff sfi sfl sfo sfs sia sib sic sif sii sil sio sis sla slb slc slf sli sll slo sls soa sob soc sof soi sol soo sos ss- ssa ssb ssc ssf ssi ssl sso sss