-al -er a-a a-b a-c aaa aab aac aae aal aar ab- aba abb abc abe abl abr ac- aca acb acc ace acl acr aea aeb aec aee ael aer al- ala alb alc ale all alr ar- ara arb arc are arl arr baa bab bac bae bal bar bba bbb bbc bbe bbl bbr bca bcb bcc bce bcl bcr be- bea beb bec bee bel ber bla blb blc ble bll blr bra brb bre brl brr c-- caa cab cac cae cal car cba cbb cbc cbe cbl cbr cca ccb ccc cce ccl ccr ce- cea ceb cec cee cel cer cl- cla clb clc cle cll clr cra crb crc cre crl crr eaa eab eac eae eal ear eba ebb ebc ebe ebl ebr ec- eca ecb ecc ece ecl ecr eea eeb eec eee eel eer ela elb elc ele ell elr era erb erc ere erl err la- laa lab lac lae lal lar lba lbb lbc lbe lbl lbr lca lcb lcc lce lcl lcr lea leb lec lee lel ler lla llb llc lle lll llr lra lrb lrc lrr ra- raa rab rac rae ral rar rba rbb rbc rbe rbl rbr rca rcb rcc rce rcl rcr re- rea reb rec ree rel rer rla rlc rle rll rlr rra rrb rrc rrl rrr