-al -ol a-a a-b a-z aaa aab aaf aal aao aar aaz ab- aba abb abf abl abo abr abz af- afa afb aff afl afo afr afz al- ala alb alf all alo alr alz aoa aob aof aol aoo aor ar- ara arb arf arl aro arr arz az- aza azb azf azo azz baa bab baf bal bao bar baz bba bbb bbf bbl bbo bbr bfa bfb bff bfl bfo bfr bfz bla blb blf bll blo blr blz boa bob bof bol boo bor boz bra brb brf brl bro brr brz bza bzf bzo bzr bzz faa fab faf fal fao far faz fba fbb fbf fbl fbo fbr ffa fff ffl ffo ffr ffz fla flb flf fll flo flr foa fob fof fol foo for foz fra frb frf frl fro frr la- laa lab laf lal lao lar laz lba lbb lbf lbl lbo lbr lfa lfb lff lfl lfo lfr lla llb llf lll llo llr llz loa lob lof lol loo lor loz lra lrb lrf lro lrr lrz lzo lzr oaa oab oaf oal oao oar ob- oba obb obf obl obo obr of- ofa ofb off ofl ofo ofr ofz ola olb olf oll olo oo- ooa oob oof ool ooo oor or- ora orb orf orl oro orr orz oza ozo ozz ra- raa rab raf ral rao rar raz rba rbb rbf rbl rbo rbr rfa rfb rff rfl rfo rfr rfz rla rlf rll rlo rlr roa rob rof rol roo ror roz rra rrb rrf rrl rrr rza rzb rzo zaa zab zaf zao zar zaz zbb zbl zbr zfa zfr zla zlr zo- zoa zob zof zol zoo zor zrl zro zzr zzz