-al -ol a-a a-b aaa aab aaf aal aan aao aas ab- aba abb abf abl abn abo abs af- afa afb aff afl afn afo afs al- ala alb alf all aln alo als an- ana anb anf anl ann ano ans aoa aob aof aol aon aoo aos as- asa asb asf asl asn aso ass baa bab baf bal ban bao bas bba bbb bbf bbl bbn bbo bbs bfa bfb bff bfl bfn bfo bfs bla blb blf bll bln blo bls bna bnb bnf bnl bnn bno bns boa bob bof bol bon boo bos bsa bsb bsf bsl bsn bso bss faa fab faf fal fan fao fas fba fbb fbf fbl fbn fbo fbs ffa fff ffl ffn ffo ffs fla flb flf fll fln flo fls fna fnb fnf fnl fnn fns foa fob fof fol fon foo fos fsa fsb fsf fsl fsn fso fss la- laa lab laf lal lan lao las lba lbb lbf lbl lbo lbs lfa lfb lff lfl lfn lfo lfs lla llb llf lll lln llo lls lna lnb lnl lnn lno lns loa lob lof lol lon loo los lsa lsb lsf lsl lsn lso lss naa nab naf nal nan nao nas nba nbb nbf nbl nbn nbo nbs nfa nfb nff nfl nfn nfo nfs nla nlb nlf nll nln nlo nls nna nnb nnf nnl nnn nno nns no- noa nob nof nol non noo nos nsa nsb nsf nsl nsn nso nss oaa oab oaf oal oan oao oas ob- oba obb obf obl obn obo obs of- ofa ofb off ofl ofn ofo ofs ola olb olf oll oln olo ols on- ona onb onf onl onn ono ons oo- ooa oob oof ool oon ooo oos os- osa osb osf osl osn oso oss saa sab saf sal san sao sas sba sbb sbf sbl sbn sbo sbs sfa sfb sff sfl sfn sfo sfs sla slb slf sll sln slo sls sna snb snf snl snn sno sns soa sob sof sol son soo sos ss- ssa ssb ssf ssl ssn sso sss