-al -ol a-a a-b a-c a-t aaa aab aac aae aaf aag aal aao aat ab- aba abb abc abe abf abg abl abo abt ac- aca acb acc ace acf acg acl aco act aea aeb aec aee aef aeg ael aeo aet af- afa afb afc afe aff afg afl afo aft ag- aga agb agc age agf agg agl ago agt al- ala alb alc ale alf alg all alo alt aoa aob aoc aoe aof aog aol aoo aot at- ata atb atc ate atf atg atl ato att baa bab bac bae baf bag bal bao bat bba bbb bbc bbe bbf bbg bbl bbo bbt bca bcb bcc bce bcf bcg bcl bco bct be- bea beb bec bee bef beg bel beo bet bfa bfb bfc bfe bff bfg bfl bfo bft bga bgb bgc bge bgf bgg bgl bgo bgt bla blb blc ble blf blg bll blo blt boa bob boc boe bof bog bol boo bot bta btb btc bte btf btg btl bto btt c-- caa cab cac cae caf cag cal cao cat cba cbb cbc cbe cbf cbg cbl cbo cbt cca ccb ccc cce ccf ccg ccl cco cct ce- cea ceb cec cee cef ceg cel ceo cet cfa cfb cfc cfe cff cfg cfl cfo cft cga cgb cgc cge cgg cgl cgo cgt cl- cla clb clc cle clf clg cll clo clt co- coa cob coc coe cof cog col coo cot cta ctb ctc cte ctf ctg ctl cto ctt eaa eab eac eae eaf eag eal eao eat eba ebb ebc ebe ebf ebg ebl ebo ebt ec- eca ecb ecc ece ecf ecg ecl eco ect eea eeb eec eee eef eeg eel eeo eet ef- efa efb efc efe eff efg efl efo eft ega egb egc ege egf egg egl ego egt ela elb elc ele elf elg ell elo elt eo- eoa eob eoc eoe eof eog eol eoo eot eta etb etc ete etf etg etl eto ett faa fab fac fae faf fag fal fao fat fba fbb fbc fbe fbf fbg fbl fbo fbt fca fcb fcc fce fcf fcg fcl fco fct fea feb fec fee fef feg fel feo fet ffa ffc ffe fff ffg ffl ffo fft fga fgb fgc fge fgf fgg fgl fgt fla flb flc fle flf flg fll flo flt foa fob foc foe fof fog fol foo fot fta ftb ftc fte ftf ftg ftl fto ftt gaa gab gac gae gaf gag gal gao gat gba gbc gbe gbf gbg gbl gbo gbt gca gcb gcc gce gcf gcg gcl gco gct ge- gea geb gec gee gef geg gel geo get gfa gfb gfc gfe gff gfl gfo gft gga ggb ggc ggg ggo ggt gla glb glc gle glf glg gll glo glt goa gob goc goe gof gog gol goo got gta gtb gtc gte gtf gtg gtl gto gtt la- laa lab lac lae laf lag lal lao lat lba lbb lbc lbe lbf lbg lbl lbo lbt lca lcb lcc lce lcf lcg lcl lco lct lea leb lec lee lef leg lel leo let lfa lfb lfc lfe lff lfg lfl lfo lft lga lgb lgc lge lgf lgg lgl lgo lgt lla llb llc lle llf llg lll llo llt loa lob loc loe lof log lol loo lot lta ltb ltc lte ltf ltg ltl lto ltt oaa oab oac oae oaf oag oal oao oat ob- oba obb obc obe obf obg obl obo obt oc- oca ocb occ ocf ocg ocl oco oct oea oeb oec oee oef oeg oel oeo oet of- ofa ofb ofc ofe off ofg ofl ofo oft oga ogc oge ogf ogg ogl ogo ogt ola olb olc ole olf olg oll olo olt oo- ooa oob ooc oof oog ool ooo oot ot- ota otb otc ote otf otg otl oto ott taa tab tac tae taf tag tal tao tat tba tbb tbc tbe tbf tbg tbl tbo tbt tca tcb tcc tce tcf tcg tcl tco tct te- tea teb tec tee tef teg tel teo tet tfa tfb tfc tfe tff tfg tfl tfo tft tga tgb tgc tge tgf tgg tgl tgo tgt tla tlc tle tlf tlg tll tlo tlt to- toa tob toc toe tof tog tol too tot tta ttb ttc tte ttf ttg ttl tto ttt