-al -er a-a a-b aaa aab aae aal aar aax ab- aba abb abe abl abr abx aea aeb aee ael aer aex al- ala alb ale all alr alx ar- ara arb are arl arr arx ax- axa axe axl axr axx baa bab bae bal bar bax bba bbb bbe bbl bbr bbx be- bea beb bee bel ber bex bla blb ble bll blr blx bra brb bre brl brr brx bxb bxl bxx eaa eab eae eal ear eax eba ebb ebe ebl ebr ebx eea eeb eee eel eer eex ela elb ele ell elr elx era erb ere erl err ex- exa exe exl exr exx la- laa lab lae lal lar lax lba lbb lbe lbl lbr lbx lea leb lee lel ler lex lla llb lle lll llr lra lrb lrr lxr lxx ra- raa rab rae ral rar rax rba rbb rbe rbl rbr rbx re- rea reb ree rel rer rex rla rle rll rlr rra rrb rrl rrr rxr xaa xal xar xbe xbl xbr xbx xee xel xer xex xla xlb xlr xrx xxl xxx