-al -ol a-a a-b a-c a-t aaa aab aac aae aal aao aat ab- aba abb abc abe abl abo abt ac- aca acb acc ace acl aco act aea aeb aec aee ael aeo aet al- ala alb alc ale all alo alt aoa aob aoc aoe aol aoo aot at- ata atb atc ate atl ato att baa bab bac bae bal bao bat bba bbb bbc bbe bbl bbo bbt bca bcb bcc bce bcl bco bct be- bea beb bec bee bel beo bet bla blb blc ble bll blo blt boa bob boc boe bol boo bot bta btb btc bte btl bto btt c-- caa cab cac cae cal cao cat cba cbb cbc cbe cbl cbo cbt cca ccb ccc cce ccl cco cct ce- cea ceb cec cee cel ceo cet cl- cla clb clc cle cll clo clt co- coa cob coc coe col coo cot cta ctb ctc cte ctl cto ctt eaa eab eac eae eal eao eat eba ebb ebc ebe ebl ebo ebt ec- eca ecb ecc ece ecl eco ect eea eeb eec eee eel eeo eet ela elb elc ele ell elo elt eo- eoa eob eoc eoe eol eoo eot eta etb etc ete etl eto ett la- laa lab lac lae lal lao lat lba lbb lbc lbe lbl lbo lbt lca lcb lcc lce lcl lco lct lea leb lec lee lel leo let lla llb llc lle lll llo llt loa lob loc loe lol loo lot lta ltb ltc lte ltl lto ltt oaa oab oac oae oal oao oat ob- oba obb obc obe obl obo obt oc- oca ocb occ ocl oco oct oea oeb oec oee oel oeo oet ola olb olc ole oll olo olt oo- ooa oob ooc ool ooo oot ot- ota otb otc ote otl oto ott taa tab tac tae tal tao tat tba tbb tbc tbe tbl tbo tbt tca tcb tcc tce tcl tco tct te- tea teb tec tee tel teo tet tla tlc tle tll tlo tlt to- toa tob toc toe tol too tot tta ttb ttc tte ttl tto ttt