-al -ol a-a a-b aaa aab aad aaf aal aan aao aar ab- aba abb abd abf abl abn abo abr ad- ada adb add adf adl adn ado adr af- afa afb afd aff afl afn afo afr al- ala alb ald alf all aln alo alr an- ana anb and anf anl ann ano anr aoa aob aod aof aol aon aoo aor ar- ara arb ard arf arl arn aro arr baa bab bad baf bal ban bao bar bba bbb bbd bbf bbl bbn bbo bbr bda bdb bdd bdf bdl bdo bdr bfa bfb bfd bff bfl bfn bfo bfr bla blb bld blf bll bln blo blr bna bnb bnd bnf bnl bnn bno bnr boa bob bod bof bol bon boo bor bra brb brd brf brl brn bro brr daa dab dad daf dal dan dao dar dba dbb dbd dbf dbl dbn dbo dbr dda ddb ddd ddf ddl ddn ddo ddr dfa dfb dfd dff dfl dfn dfo dfr dl- dla dlb dld dlf dll dlo dlr dna dnb dnd dnf dnl dnn dno dnr doa dob dod dof dol don doo dor dra drb drd drl drn dro drr faa fab fad faf fal fan fao far fba fbb fbd fbf fbl fbn fbo fbr fda fdb fdd fdf fdl fdn fdo fdr ffa ffd fff ffl ffn ffo ffr fla flb fld flf fll fln flo flr fna fnb fnd fnf fnl fnn fnr foa fob fof fol fon foo for fra frb frd frf frl frn fro frr la- laa lab lad laf lal lan lao lar lba lbb lbd lbf lbl lbo lbr lda ldb ldd ldf ldl ldn ldo ldr lfa lfb lfd lff lfl lfn lfo lfr lla llb lld llf lll lln llo llr lna lnb lnd lnl lnn lno lnr loa lob lod lof lol lon loo lor lra lrb lrd lrf lrn lro lrr naa nab nad naf nal nan nao nar nba nbb nbd nbf nbl nbn nbo nbr nda ndb ndd ndf ndl ndn ndo ndr nfa nfb nfd nff nfl nfn nfo nfr nla nlb nld nlf nll nln nlo nlr nna nnb nnf nnl nnn nno no- noa nob nod nof nol non noo nor nra nrb nrd nrf nrl nrn nro nrr oaa oab oad oaf oal oan oao oar ob- oba obb obd obf obl obn obo obr oda odb odd odf odl odn odo odr of- ofa ofb ofd off ofl ofn ofo ofr ola olb old olf oll oln olo on- ona onb ond onf onl onn ono onr oo- ooa oob ood oof ool oon ooo oor or- ora orb ord orf orl orn oro orr ra- raa rab rad raf ral ran rao rar rba rbb rbd rbf rbl rbn rbo rbr rda rdb rdd rdf rdl rdn rdo rdr rfa rfb rfd rff rfl rfn rfo rfr rla rld rlf rll rln rlo rlr rna rnb rnd rnn rno rnr roa rob rod rof rol ron roo ror rra rrb rrd rrf rrl rrn rrr