-al a-a a-b a-i aaa aab aaf aai aal ab- aba abb abf abi abl af- afa afb aff afi afl ai- aia aib aif aii ail al- ala alb alf ali all baa bab baf bai bal bba bbb bbf bbi bbl bfa bfb bff bfi bfl bi- bia bib bif bii bil bla blb blf bli bll faa fab faf fai fal fba fbb fbf fbi fbl ffa fff ffi ffl fia fib fif fii fil fla flb flf fli fll i-f ia- iaa iab iaf iai ial iba ibb ibf ibi ibl ifa ifb iff ifi ifl iia iib iif iii iil il- ila ilb ilf ili ill la- laa lab laf lai lal lba lbb lbf lbi lbl lfa lfb lff lfi lfl lia lib lif lii lil lla llb llf lli lll