-al -er a-a a-b a-i a-t aaa aab aae aai aal aar aat aax ab- aba abb abe abi abl abr abt abx aea aeb aee aei ael aer aet aex ai- aia aib aie aii ail air ait aix al- ala alb ale ali all alr alt alx ar- ara arb are ari arl arr art arx at- ata atb ate ati atl atr att atx ax- axa axe axi axl axr axt axx baa bab bae bai bal bar bat bax bba bbb bbe bbi bbl bbr bbt bbx be- bea beb bee bei bel ber bet bex bi- bia bib bie bii bil bir bit bix bla blb ble bli bll blr blt blx bra brb bre bri brl brr brt brx bta btb bte bti btl btr btt btx bxb bxi bxl bxx eaa eab eae eai eal ear eat eax eba ebb ebe ebi ebl ebr ebt ebx eea eeb eee eel eer eet eex eia eib eie eii eil eir eit eix ela elb ele eli ell elr elt elx era erb ere eri erl err ert eta etb ete eti etl etr ett etx ex- exa exe exi exl exr ext exx ia- iaa iab iae iai ial iar iat iba ibb ibe ibi ibl ibr ibt ibx ie- iea iee iei iel ier iet iex iia iib iie iii iil iir iit iix il- ila ilb ile ili ill ilr ilt ilx ir- ira irb ire iri irl irr irt irx ita itb ite iti itl itt itx ixe ixi ixl la- laa lab lae lai lal lar lat lax lba lbb lbe lbi lbl lbr lbt lbx lea leb lee lei lel ler let lex lia lib lie lii lil lir lit lix lla llb lle lli lll llr llt lra lrb lri lrr lrt lta ltb lte lti ltl ltr ltt ltx lxi lxr lxx ra- raa rab rae rai ral rar rat rax rba rbb rbe rbi rbl rbr rbt rbx re- rea reb ree rei rel rer ret rex ria rib rie rii ril rir rit rix rla rle rli rll rlr rlt rra rrb rri rrl rrr rrt rta rtb rte rti rtl rtr rtt rtx rxr t-x taa tab tae tai tal tar tat tax tba tbb tbe tbi tbl tbr tbt te- tea teb tee tei tel ter tet tex tia tib tie tii til tir tit tix tla tle tli tll tlr tlt tlx tra trb tre tri trl trr trt trx tta ttb tte tti ttl ttr ttt ttx txe txi txl txt xaa xal xar xat xbe xbl xbr xbx xee xel xer xet xex xia xie xii xit xix xla xlb xli xlr xlt xrt xrx xti xtr xtx xxi xxl xxx