-al -er a-a a-c aaa aac aae aaf aal aar aax ac- aca acc ace acf acl acr acx aea aec aee aef ael aer aex af- afa afc afe aff afl afr afx al- ala alc ale alf all alr alx ar- ara arc are arf arl arr arx ax- axa axe axl axr axx c-- caa cac cae caf cal car cax cca ccc cce ccf ccl ccr ccx ce- cea cec cee cef cel cer cex cfa cfc cfe cff cfl cfr cfx cl- cla clc cle clf cll clr clx cra crc cre crf crl crr crx cxc cxf cxl cxr cxx eaa eac eae eaf eal ear eax ec- eca ecc ece ecf ecl ecr ecx eea eec eee eef eel eer eex ef- efa efc efe eff efl efr efx ela elc ele elf ell elr elx era erc ere erf erl err ex- exa exc exe exl exr exx faa fac fae faf fal far fax fca fcc fce fcf fcl fcr fcx fea fec fee fef fel fer fex ffa ffc ffe fff ffl ffr ffx fla flc fle flf fll flr flx fra frc fre frf frl frr fxe fxr fxx la- laa lac lae laf lal lar lax lca lcc lce lcf lcl lcr lcx lea lec lee lef lel ler lex lfa lfc lfe lff lfl lfr lfx lla llc lle llf lll llr lra lrc lrf lrr lxc lxr lxx ra- raa rac rae raf ral rar rax rca rcc rce rcf rcl rcr rcx re- rea rec ree ref rel rer rex rfa rfc rfe rff rfl rfr rla rlc rle rlf rll rlr rra rrc rrf rrl rrr rxr xaa xac xaf xal xar xcf xcl xcr xcx xee xel xer xex xfa xfe xfl xfx xla xlf xlr xrc xrf xrx xxl xxx