-al -er a-a a-b a-c a-t aaa aab aac aae aal aar aat ab- aba abb abc abe abl abr abt ac- aca acb acc ace acl acr act aea aeb aec aee ael aer aet al- ala alb alc ale all alr alt ar- ara arb arc are arl arr art at- ata atb atc ate atl atr att baa bab bac bae bal bar bat bba bbb bbc bbe bbl bbr bbt bca bcb bcc bce bcl bcr bct be- bea beb bec bee bel ber bet bla blb blc ble bll blr blt bra brb bre brl brr brt bta btb btc bte btl btr btt c-- caa cab cac cae cal car cat cba cbb cbc cbe cbl cbr cbt cca ccb ccc cce ccl ccr cct ce- cea ceb cec cee cel cer cet cl- cla clb clc cle cll clr clt cra crb crc cre crl crr crt cta ctb ctc cte ctl ctr ctt eaa eab eac eae eal ear eat eba ebb ebc ebe ebl ebr ebt ec- eca ecb ecc ece ecl ecr ect eea eeb eec eee eel eer eet ela elb elc ele ell elr elt era erb erc ere erl err ert eta etb etc ete etl etr ett la- laa lab lac lae lal lar lat lba lbb lbc lbe lbl lbr lbt lca lcb lcc lce lcl lcr lct lea leb lec lee lel ler let lla llb llc lle lll llr llt lra lrb lrc lrr lrt lta ltb ltc lte ltl ltr ltt ra- raa rab rac rae ral rar rat rba rbb rbc rbe rbl rbr rbt rca rcb rcc rce rcl rcr rct re- rea reb rec ree rel rer ret rla rlc rle rll rlr rlt rra rrb rrc rrl rrr rrt rta rtb rtc rte rtl rtr rtt taa tab tac tae tal tar tat tba tbb tbc tbe tbl tbr tbt tca tcb tcc tce tcl tcr tct te- tea teb tec tee tel ter tet tla tlc tle tll tlr tlt tra trb trc tre trl trr trt tta ttb ttc tte ttl ttr ttt