-al -ol a-a a-b a-c a-t aaa aab aac aae aaf aal aao aat ab- aba abb abc abe abf abl abo abt ac- aca acb acc ace acf acl aco act aea aeb aec aee aef ael aeo aet af- afa afb afc afe aff afl afo aft al- ala alb alc ale alf all alo alt aoa aob aoc aoe aof aol aoo aot at- ata atb atc ate atf atl ato att baa bab bac bae baf bal bao bat bba bbb bbc bbe bbf bbl bbo bbt bca bcb bcc bce bcf bcl bco bct be- bea beb bec bee bef bel beo bet bfa bfb bfc bfe bff bfl bfo bft bla blb blc ble blf bll blo blt boa bob boc boe bof bol boo bot bta btb btc bte btf btl bto btt c-- caa cab cac cae caf cal cao cat cba cbb cbc cbe cbf cbl cbo cbt cca ccb ccc cce ccf ccl cco cct ce- cea ceb cec cee cef cel ceo cet cfa cfb cfc cfe cff cfl cfo cft cl- cla clb clc cle clf cll clo clt co- coa cob coc coe cof col coo cot cta ctb ctc cte ctf ctl cto ctt eaa eab eac eae eaf eal eao eat eba ebb ebc ebe ebf ebl ebo ebt ec- eca ecb ecc ece ecf ecl eco ect eea eeb eec eee eef eel eeo eet ef- efa efb efc efe eff efl efo eft ela elb elc ele elf ell elo elt eo- eoa eob eoc eoe eof eol eoo eot eta etb etc ete etf etl eto ett faa fab fac fae faf fal fao fat fba fbb fbc fbe fbf fbl fbo fbt fca fcb fcc fce fcf fcl fco fct fea feb fec fee fef fel feo fet ffa ffc ffe fff ffl ffo fft fla flb flc fle flf fll flo flt foa fob foc foe fof fol foo fot fta ftb ftc fte ftf ftl fto ftt la- laa lab lac lae laf lal lao lat lba lbb lbc lbe lbf lbl lbo lbt lca lcb lcc lce lcf lcl lco lct lea leb lec lee lef lel leo let lfa lfb lfc lfe lff lfl lfo lft lla llb llc lle llf lll llo llt loa lob loc loe lof lol loo lot lta ltb ltc lte ltf ltl lto ltt oaa oab oac oae oaf oal oao oat ob- oba obb obc obe obf obl obo obt oc- oca ocb occ ocf ocl oco oct oea oeb oec oee oef oel oeo oet of- ofa ofb ofc ofe off ofl ofo oft ola olb olc ole olf oll olo olt oo- ooa oob ooc oof ool ooo oot ot- ota otb otc ote otf otl oto ott taa tab tac tae taf tal tao tat tba tbb tbc tbe tbf tbl tbo tbt tca tcb tcc tce tcf tcl tco tct te- tea teb tec tee tef tel teo tet tfa tfb tfc tfe tff tfl tfo tft tla tlc tle tlf tll tlo tlt to- toa tob toc toe tof tol too tot tta ttb ttc tte ttf ttl tto ttt