-al -er a-a a-b a-c a-t aaa aab aac aae aaf aal aar aat ab- aba abb abc abe abf abl abr abt ac- aca acb acc ace acf acl acr act aea aeb aec aee aef ael aer aet af- afa afb afc afe aff afl afr aft al- ala alb alc ale alf all alr alt ar- ara arb arc are arf arl arr art at- ata atb atc ate atf atl atr att baa bab bac bae baf bal bar bat bba bbb bbc bbe bbf bbl bbr bbt bca bcb bcc bce bcf bcl bcr bct be- bea beb bec bee bef bel ber bet bfa bfb bfc bfe bff bfl bfr bft bla blb blc ble blf bll blr blt bra brb bre brf brl brr brt bta btb btc bte btf btl btr btt c-- caa cab cac cae caf cal car cat cba cbb cbc cbe cbf cbl cbr cbt cca ccb ccc cce ccf ccl ccr cct ce- cea ceb cec cee cef cel cer cet cfa cfb cfc cfe cff cfl cfr cft cl- cla clb clc cle clf cll clr clt cra crb crc cre crf crl crr crt cta ctb ctc cte ctf ctl ctr ctt eaa eab eac eae eaf eal ear eat eba ebb ebc ebe ebf ebl ebr ebt ec- eca ecb ecc ece ecf ecl ecr ect eea eeb eec eee eef eel eer eet ef- efa efb efc efe eff efl efr eft ela elb elc ele elf ell elr elt era erb erc ere erf erl err ert eta etb etc ete etf etl etr ett faa fab fac fae faf fal far fat fba fbb fbc fbe fbf fbl fbr fbt fca fcb fcc fce fcf fcl fcr fct fea feb fec fee fef fel fer fet ffa ffc ffe fff ffl ffr fft fla flb flc fle flf fll flr flt fra frb frc fre frf frl frr frt fta ftb ftc fte ftf ftl ftr ftt la- laa lab lac lae laf lal lar lat lba lbb lbc lbe lbf lbl lbr lbt lca lcb lcc lce lcf lcl lcr lct lea leb lec lee lef lel ler let lfa lfb lfc lfe lff lfl lfr lft lla llb llc lle llf lll llr llt lra lrb lrc lrf lrr lrt lta ltb ltc lte ltf ltl ltr ltt ra- raa rab rac rae raf ral rar rat rba rbb rbc rbe rbf rbl rbr rbt rca rcb rcc rce rcf rcl rcr rct re- rea reb rec ree ref rel rer ret rfa rfb rfc rfe rff rfl rfr rft rla rlc rle rlf rll rlr rlt rra rrb rrc rrf rrl rrr rrt rta rtb rtc rte rtf rtl rtr rtt taa tab tac tae taf tal tar tat tba tbb tbc tbe tbf tbl tbr tbt tca tcb tcc tce tcf tcl tcr tct te- tea teb tec tee tef tel ter tet tfa tfb tfc tfe tff tfl tfr tft tla tlc tle tlf tll tlr tlt tra trb trc tre trf trl trr trt tta ttb ttc tte ttf ttl ttr ttt