-al -er a-a a-b a-c aaa aab aac aae aaf aal aar ab- aba abb abc abe abf abl abr ac- aca acb acc ace acf acl acr aea aeb aec aee aef ael aer af- afa afb afc afe aff afl afr al- ala alb alc ale alf all alr ar- ara arb arc are arf arl arr baa bab bac bae baf bal bar bba bbb bbc bbe bbf bbl bbr bca bcb bcc bce bcf bcl bcr be- bea beb bec bee bef bel ber bfa bfb bfc bfe bff bfl bfr bla blb blc ble blf bll blr bra brb bre brf brl brr c-- caa cab cac cae caf cal car cba cbb cbc cbe cbf cbl cbr cca ccb ccc cce ccf ccl ccr ce- cea ceb cec cee cef cel cer cfa cfb cfc cfe cff cfl cfr cl- cla clb clc cle clf cll clr cra crb crc cre crf crl crr eaa eab eac eae eaf eal ear eba ebb ebc ebe ebf ebl ebr ec- eca ecb ecc ece ecf ecl ecr eea eeb eec eee eef eel eer ef- efa efb efc efe eff efl efr ela elb elc ele elf ell elr era erb erc ere erf erl err faa fab fac fae faf fal far fba fbb fbc fbe fbf fbl fbr fca fcb fcc fce fcf fcl fcr fea feb fec fee fef fel fer ffa ffc ffe fff ffl ffr fla flb flc fle flf fll flr fra frb frc fre frf frl frr la- laa lab lac lae laf lal lar lba lbb lbc lbe lbf lbl lbr lca lcb lcc lce lcf lcl lcr lea leb lec lee lef lel ler lfa lfb lfc lfe lff lfl lfr lla llb llc lle llf lll llr lra lrb lrc lrf lrr ra- raa rab rac rae raf ral rar rba rbb rbc rbe rbf rbl rbr rca rcb rcc rce rcf rcl rcr re- rea reb rec ree ref rel rer rfa rfb rfc rfe rff rfl rfr rla rlc rle rlf rll rlr rra rrb rrc rrf rrl rrr