-al a-a a-b a-c aaa aab aac aal aan aar aau ab- aba abb abc abl abn abr abu ac- aca acb acc acl acn acr acu al- ala alb alc all aln alr alu an- ana anb anc anl ann anr anu ar- ara arb arc arl arn arr aru au- aua aub auc aul aun aur b-u baa bab bac bal ban bar bau bba bbb bbc bbl bbn bbr bbu bca bcb bcc bcl bcn bcr bcu bla blb blc bll bln blr blu bna bnb bnc bnl bnn bnr bnu bra brb brl brn brr bru bua bub buc bul bun bur buu c-- caa cab cac cal can car cau cba cbb cbc cbl cbn cbr cbu cca ccb ccc ccl ccn ccr ccu cl- cla clb clc cll cln clr clu cn- cna cnb cnc cnl cnn cnr cnu cra crb crc crl crn crr cru cua cub cuc cul cun cur cuu la- laa lab lac lal lan lar lau lba lbb lbc lbl lbr lbu lca lcb lcc lcl lcn lcr lcu lla llb llc lll lln llr llu lna lnb lnc lnl lnn lnr lnu lra lrb lrc lrn lrr lru lua lub luc lul lun lur luu naa nab nac nal nan nar nau nba nbb nbc nbl nbn nbr nbu nca ncb ncc ncl ncn ncr ncu nla nlb nlc nll nln nlr nlu nna nnb nnc nnl nnn nnu nra nrb nrc nrl nrn nrr nru nua nub nuc nul nun nur nuu ra- raa rab rac ral ran rar rau rba rbb rbc rbl rbn rbr rbu rca rcb rcc rcl rcn rcr rcu rla rlc rll rln rlr rlu rna rnb rnc rnn rnr rnu rra rrb rrc rrl rrn rrr rru rua rub ruc run rur ruu ua- uaa uab uac ual uan uar uau uba ubb ubc ubl ubn ubr ubu uca ucb ucc ucl ucn ucr ucu ula ulb ulc ull uln ulr ulu un- una unb unc unl unn unr unu ur- ura urb urc url urn urr uru uua uuc uun uur uuu