-al -ol a-a a-b a-t aaa aab aal aan aao aar aat ab- aba abb abl abn abo abr abt al- ala alb all aln alo alr alt an- ana anb anl ann ano anr ant aoa aob aol aon aoo aor aot ar- ara arb arl arn aro arr art at- ata atb atl atn ato atr att baa bab bal ban bao bar bat bba bbb bbl bbn bbo bbr bbt bla blb bll bln blo blr blt bna bnb bnl bnn bno bnr bnt boa bob bol bon boo bor bot bra brb brl brn bro brr brt bta btb btl btn bto btr btt la- laa lab lal lan lao lar lat lba lbb lbl lbo lbr lbt lla llb lll lln llo llr llt lna lnb lnl lnn lno lnr lnt loa lob lol lon loo lor lot lra lrb lrn lro lrr lrt lta ltb ltl lto ltr ltt naa nab nal nan nao nar nat nba nbb nbl nbn nbo nbr nbt nla nlb nll nln nlo nlr nlt nna nnb nnl nnn nno nnt no- noa nob nol non noo nor not nra nrb nrl nrn nro nrr nrt nta ntb ntn nto ntr ntt oaa oab oal oan oao oar oat ob- oba obb obl obn obo obr obt ola olb oll oln olo olt on- ona onb onl onn ono onr ont oo- ooa oob ool oon ooo oor oot or- ora orb orl orn oro orr ort ot- ota otb otl otn oto otr ott ra- raa rab ral ran rao rar rat rba rbb rbl rbn rbo rbr rbt rla rll rln rlo rlr rlt rna rnb rnn rno rnr rnt roa rob rol ron roo ror rot rra rrb rrl rrn rrr rrt rta rtb rtl rtn rto rtr rtt taa tab tal tan tao tar tat tba tbb tbl tbn tbo tbr tbt tla tll tln tlo tlr tlt tna tnb tnl tnn tno tnr tnt to- toa tob tol ton too tor tot tra trb trl trn tro trr trt tta ttb ttl ttn tto ttr ttt