-al -ol a-a a-b a-c aaa aab aac aal aan aao aar aau ab- aba abb abc abl abn abo abr abu ac- aca acb acc acl acn aco acr acu al- ala alb alc all aln alo alr alu an- ana anb anc anl ann ano anr anu aoa aob aoc aol aon aoo aor aou ar- ara arb arc arl arn aro arr aru au- aua aub auc aul aun auo aur b-u baa bab bac bal ban bao bar bau bba bbb bbc bbl bbn bbo bbr bbu bca bcb bcc bcl bcn bco bcr bcu bla blb blc bll bln blo blr blu bna bnb bnc bnl bnn bno bnr bnu boa bob boc bol bon boo bor bou bra brb brl brn bro brr bru bua bub buc bul bun buo bur buu c-- caa cab cac cal can cao car cau cba cbb cbc cbl cbn cbo cbr cbu cca ccb ccc ccl ccn cco ccr ccu cl- cla clb clc cll cln clo clr clu cn- cna cnb cnc cnl cnn cno cnr cnu co- coa cob coc col con coo cor cou cra crb crc crl crn cro crr cru cua cub cuc cul cun cuo cur cuu la- laa lab lac lal lan lao lar lau lba lbb lbc lbl lbo lbr lbu lca lcb lcc lcl lcn lco lcr lcu lla llb llc lll lln llo llr llu lna lnb lnc lnl lnn lno lnr lnu loa lob loc lol lon loo lor lou lra lrb lrc lrn lro lrr lru lua lub luc lul lun luo lur luu naa nab nac nal nan nao nar nau nba nbb nbc nbl nbn nbo nbr nbu nca ncb ncc ncl ncn nco ncr ncu nla nlb nlc nll nln nlo nlr nlu nna nnb nnc nnl nnn nno nnu no- noa nob noc nol non noo nor nou nra nrb nrc nrl nrn nro nrr nru nua nub nuc nul nun nuo nur nuu oaa oab oac oal oan oao oar oau ob- oba obb obc obl obn obo obr obu oc- oca ocb occ ocl ocn oco ocr ocu ola olb olc oll oln olo olu on- ona onb onc onl onn ono onr onu oo- ooa oob ooc ool oon ooo oor or- ora orb orc orl orn oro orr oru ou- oua ouc oul oun ouo our ra- raa rab rac ral ran rao rar rau rba rbb rbc rbl rbn rbo rbr rbu rca rcb rcc rcl rcn rco rcr rcu rla rlc rll rln rlo rlr rlu rna rnb rnc rnn rno rnr rnu roa rob roc rol ron roo ror rou rra rrb rrc rrl rrn rrr rru rua rub ruc run ruo rur ruu ua- uaa uab uac ual uan uao uar uau uba ubb ubc ubl ubn ubo ubr ubu uca ucb ucc ucl ucn uco ucr ucu ula ulb ulc ull uln ulo ulr ulu un- una unb unc unl unn uno unr unu uoa uob uoc uol uon uoo uor ur- ura urb urc url urn uro urr uru uua uuc uun uur uuu