-al -er a-a a-b a-c a-t aaa aab aac aad aae aal aar aat ab- aba abb abc abd abe abl abr abt ac- aca acb acc acd ace acl acr act ad- ada adb adc add ade adl adr adt aea aeb aec aed aee ael aer aet al- ala alb alc ald ale all alr alt ar- ara arb arc ard are arl arr art at- ata atb atc atd ate atl atr att baa bab bac bad bae bal bar bat bba bbb bbc bbd bbe bbl bbr bbt bca bcb bcc bcd bce bcl bcr bct bda bdb bdc bdd bde bdl bdr bdt be- bea beb bec bed bee bel ber bet bla blb blc bld ble bll blr blt bra brb brd bre brl brr brt bta btb btc btd bte btl btr btt c-- caa cab cac cad cae cal car cat cba cbb cbc cbd cbe cbl cbr cbt cca ccb ccc ccd cce ccl ccr cct cda cdb cdc cdd cde cdl cdr cdt ce- cea ceb cec ced cee cel cer cet cl- cla clb clc cld cle cll clr clt cra crb crc crd cre crl crr crt cta ctb ctc ctd cte ctl ctr ctt daa dab dac dad dae dal dar dat dba dbb dbc dbd dbe dbl dbr dbt dca dcb dcc dcd dce dcl dcr dct dda ddb ddc ddd dde ddl ddr ddt de- dea deb dec ded dee del der det dl- dla dlb dlc dld dle dll dlr dlt dra drb drc drd dre drl drr drt dta dtb dtc dtd dte dtl dtr dtt eaa eab eac ead eae eal ear eat eba ebb ebc ebd ebe ebl ebr ebt ec- eca ecb ecc ecd ece ecl ecr ect ed- eda edb edc edd ede edl edr edt eea eeb eec eed eee eel eer eet ela elb elc eld ele ell elr elt era erb erc erd ere erl err ert eta etb etc etd ete etl etr ett la- laa lab lac lad lae lal lar lat lba lbb lbc lbd lbe lbl lbr lbt lca lcb lcc lcd lce lcl lcr lct lda ldb ldc ldd lde ldl ldr ldt lea leb lec led lee lel ler let lla llb llc lld lle lll llr llt lra lrb lrc lrd lrr lrt lta ltb ltc ltd lte ltl ltr ltt ra- raa rab rac rad rae ral rar rat rba rbb rbc rbd rbe rbl rbr rbt rca rcb rcc rcd rce rcl rcr rct rda rdb rdc rdd rde rdl rdr rdt re- rea reb rec red ree rel rer ret rla rlc rld rle rll rlr rlt rra rrb rrc rrd rrl rrr rrt rta rtb rtc rtd rte rtl rtr rtt taa tab tac tad tae tal tar tat tba tbb tbc tbd tbe tbl tbr tbt tca tcb tcc tcd tce tcl tcr tct tda tdb tdc tdd tde tdl tdr tdt te- tea teb tec ted tee tel ter tet tla tlc tld tle tll tlr tlt tra trb trc trd tre trl trr trt tta ttb ttc ttd tte ttl ttr ttt