-al a-a a-b a-i a-t aaa aab aai aal aan aar aat ab- aba abb abi abl abn abr abt ai- aia aib aii ail ain air ait al- ala alb ali all aln alr alt an- ana anb ani anl ann anr ant ar- ara arb ari arl arn arr art at- ata atb ati atl atn atr att baa bab bai bal ban bar bat bba bbb bbi bbl bbn bbr bbt bi- bia bib bii bil bin bir bit bla blb bli bll bln blr blt bna bnb bni bnl bnn bnr bnt bra brb bri brl brn brr brt bta btb bti btl btn btr btt ia- iaa iab iai ial ian iar iat iba ibb ibi ibl ibn ibr ibt iia iib iii iil iin iir iit il- ila ilb ili ill iln ilr ilt in- ina inb ini inl inn inr int ir- ira irb iri irl irn irr irt ita itb iti itl itn itt la- laa lab lai lal lan lar lat lba lbb lbi lbl lbr lbt lia lib lii lil lin lir lit lla llb lli lll lln llr llt lna lnb lni lnl lnn lnr lnt lra lrb lri lrn lrr lrt lta ltb lti ltl ltr ltt n-i naa nab nai nal nan nar nat nba nbb nbi nbl nbn nbr nbt nia nib nii nil nin nir nit nla nlb nli nll nln nlr nlt nna nnb nni nnl nnn nnt nra nrb nri nrl nrn nrr nrt nta ntb nti ntn ntr ntt ra- raa rab rai ral ran rar rat rba rbb rbi rbl rbn rbr rbt ria rib rii ril rin rir rit rla rli rll rln rlr rlt rna rnb rni rnn rnr rnt rra rrb rri rrl rrn rrr rrt rta rtb rti rtl rtn rtr rtt taa tab tai tal tan tar tat tba tbb tbi tbl tbn tbr tbt tia tib tii til tin tir tit tla tli tll tln tlr tlt tna tnb tni tnl tnn tnr tnt tra trb tri trl trn trr trt tta ttb tti ttl ttn ttr ttt