-al a-a a-b a-c a-t aaa aab aac aae aaf aal aat ab- aba abb abc abe abf abl abt ac- aca acb acc ace acf acl act aea aeb aec aee aef ael aet af- afa afb afc afe aff afl aft al- ala alb alc ale alf all alt at- ata atb atc ate atf atl att baa bab bac bae baf bal bat bba bbb bbc bbe bbf bbl bbt bca bcb bcc bce bcf bcl bct be- bea beb bec bee bef bel bet bfa bfb bfc bfe bff bfl bft bla blb blc ble blf bll blt bta btb btc bte btf btl btt c-- caa cab cac cae caf cal cat cba cbb cbc cbe cbf cbl cbt cca ccb ccc cce ccf ccl cct ce- cea ceb cec cee cef cel cet cfa cfb cfc cfe cff cfl cft cl- cla clb clc cle clf cll clt cta ctb ctc cte ctf ctl ctt eaa eab eac eae eaf eal eat eba ebb ebc ebe ebf ebl ebt ec- eca ecb ecc ece ecf ecl ect eea eeb eec eee eef eel eet ef- efa efb efc efe eff efl eft ela elb elc ele elf ell elt eta etb etc ete etf etl ett faa fab fac fae faf fal fat fba fbb fbc fbe fbf fbl fbt fca fcb fcc fce fcf fcl fct fea feb fec fee fef fel fet ffa ffc ffe fff ffl fft fla flb flc fle flf fll flt fta ftb ftc fte ftf ftl ftt la- laa lab lac lae laf lal lat lba lbb lbc lbe lbf lbl lbt lca lcb lcc lce lcf lcl lct lea leb lec lee lef lel let lfa lfb lfc lfe lff lfl lft lla llb llc lle llf lll llt lta ltb ltc lte ltf ltl ltt taa tab tac tae taf tal tat tba tbb tbc tbe tbf tbl tbt tca tcb tcc tce tcf tcl tct te- tea teb tec tee tef tel tet tfa tfb tfc tfe tff tfl tft tla tlc tle tlf tll tlt tta ttb ttc tte ttf ttl ttt