-al -ol a-a a-b a-c aaa aab aac aae aal aao aau ab- aba abb abc abe abl abo abu ac- aca acb acc ace acl aco acu aea aeb aec aee ael aeo aeu al- ala alb alc ale all alo alu aoa aob aoc aoe aol aoo aou au- aua aub auc aue aul auo b-u baa bab bac bae bal bao bau bba bbb bbc bbe bbl bbo bbu bca bcb bcc bce bcl bco bcu be- bea beb bec bee bel beo beu bla blb blc ble bll blo blu boa bob boc boe bol boo bou bua bub buc bue bul buo buu c-- caa cab cac cae cal cao cau cba cbb cbc cbe cbl cbo cbu cca ccb ccc cce ccl cco ccu ce- cea ceb cec cee cel ceo ceu cl- cla clb clc cle cll clo clu co- coa cob coc coe col coo cou cua cub cuc cue cul cuo cuu eaa eab eac eae eal eao eau eba ebb ebc ebe ebl ebo ebu ec- eca ecb ecc ece ecl eco ecu eea eeb eec eee eel eeo ela elb elc ele ell elo elu eo- eoa eob eoc eoe eol eoo eou eu- eua eub euc eue eul la- laa lab lac lae lal lao lau lba lbb lbc lbe lbl lbo lbu lca lcb lcc lce lcl lco lcu lea leb lec lee lel leo leu lla llb llc lle lll llo llu loa lob loc loe lol loo lou lua lub luc lue lul luo luu oaa oab oac oae oal oao oau ob- oba obb obc obe obl obo obu oc- oca ocb occ ocl oco ocu oea oeb oec oee oel oeo ola olb olc ole oll olo olu oo- ooa oob ooc ool ooo ou- oua ouc oue oul ouo ua- uaa uab uac uae ual uao uau uba ubb ubc ube ubl ubo ubu uca ucb ucc uce ucl uco ucu uea ueb uec uee uel ula ulb ulc ule ull ulo ulu uoa uob uoc uoe uol uoo uua uuc uue uuu