-al -ol a-a a-b a-t aaa aab aad aaf aal aao aar aat ab- aba abb abd abf abl abo abr abt ad- ada adb add adf adl ado adr adt af- afa afb afd aff afl afo afr aft al- ala alb ald alf all alo alr alt aoa aob aod aof aol aoo aor aot ar- ara arb ard arf arl aro arr art at- ata atb atd atf atl ato atr att baa bab bad baf bal bao bar bat bba bbb bbd bbf bbl bbo bbr bbt bda bdb bdd bdf bdl bdo bdr bdt bfa bfb bfd bff bfl bfo bfr bft bla blb bld blf bll blo blr blt boa bob bod bof bol boo bor bot bra brb brd brf brl bro brr brt bta btb btd btf btl bto btr btt daa dab dad daf dal dao dar dat dba dbb dbd dbf dbl dbo dbr dbt dda ddb ddd ddf ddl ddo ddr ddt dfa dfb dfd dff dfl dfo dfr dft dl- dla dlb dld dlf dll dlo dlr dlt doa dob dod dof dol doo dor dot dra drb drd drl dro drr drt dta dtb dtd dtf dtl dto dtr dtt faa fab fad faf fal fao far fat fba fbb fbd fbf fbl fbo fbr fbt fda fdb fdd fdf fdl fdo fdr fdt ffa ffd fff ffl ffo ffr fft fla flb fld flf fll flo flr flt foa fob fof fol foo for fot fra frb frd frf frl fro frr frt fta ftb ftd ftf ftl fto ftr ftt la- laa lab lad laf lal lao lar lat lba lbb lbd lbf lbl lbo lbr lbt lda ldb ldd ldf ldl ldo ldr ldt lfa lfb lfd lff lfl lfo lfr lft lla llb lld llf lll llo llr llt loa lob lod lof lol loo lor lot lra lrb lrd lrf lro lrr lrt lta ltb ltd ltf ltl lto ltr ltt oaa oab oad oaf oal oao oar oat ob- oba obb obd obf obl obo obr obt oda odb odd odf odl odo odr odt of- ofa ofb ofd off ofl ofo ofr oft ola olb old olf oll olo olt oo- ooa oob ood oof ool ooo oor oot or- ora orb ord orf orl oro orr ort ot- ota otb otd otf otl oto otr ott ra- raa rab rad raf ral rao rar rat rba rbb rbd rbf rbl rbo rbr rbt rda rdb rdd rdf rdl rdo rdr rdt rfa rfb rfd rff rfl rfo rfr rft rla rld rlf rll rlo rlr rlt roa rob rod rof rol roo ror rot rra rrb rrd rrf rrl rrr rrt rta rtb rtd rtf rtl rto rtr rtt taa tab tad taf tal tao tar tat tba tbb tbd tbf tbl tbo tbr tbt tda tdb tdd tdf tdl tdo tdr tdt tfa tfb tfd tff tfl tfo tfr tft tla tld tlf tll tlo tlr tlt to- toa tob tod tof tol too tor tot tra trb trd trf trl tro trr trt tta ttb ttd ttf ttl tto ttr ttt