-al -ol a-a a-b a-t a-z aaa aab aal aao aar aat aaz ab- aba abb abl abo abr abt abz al- ala alb all alo alr alt alz aoa aob aol aoo aor aot ar- ara arb arl aro arr art arz at- ata atb atl ato atr att atz az- aza azb azo azt azz baa bab bal bao bar bat baz bba bbb bbl bbo bbr bbt bla blb bll blo blr blt blz boa bob bol boo bor bot boz bra brb brl bro brr brt brz bta btb btl bto btr btt btz bza bzo bzr bzz la- laa lab lal lao lar lat laz lba lbb lbl lbo lbr lbt lla llb lll llo llr llt llz loa lob lol loo lor lot loz lra lrb lro lrr lrt lrz lta ltb ltl lto ltr ltt ltz lzo lzr oaa oab oal oao oar oat ob- oba obb obl obo obr obt ola olb oll olo olt oo- ooa oob ool ooo oor oot or- ora orb orl oro orr ort orz ot- ota otb otl oto otr ott otz oza ozo ozt ozz ra- raa rab ral rao rar rat raz rba rbb rbl rbo rbr rbt rla rll rlo rlr rlt roa rob rol roo ror rot roz rra rrb rrl rrr rrt rta rtb rtl rto rtr rtt rtz rza rzb rzo taa tab tal tao tar tat taz tba tbb tbl tbo tbr tbt tbz tla tll tlo tlr tlt tlz to- toa tob tol too tor tot toz tra trb trl tro trr trt trz tta ttb ttl tto ttr ttt tza zaa zab zao zar zat zaz zbb zbl zbr zbt zla zlr zlt zo- zoa zob zol zoo zor zot zrl zro zta ztl ztr zzr zzt zzz