-er -th a-a a-b a-t aaa aab aae aah aan aao aar aat ab- aba abb abe abh abn abo abr abt aea aeb aee aeh aen aeo aer aet aha ahb ahe ahh ahn aho ahr aht an- ana anb ane anh ann ano anr ant aoa aob aoe aoh aon aoo aor aot ar- ara arb are arh arn aro arr art at- ata atb ate ath atn ato atr att baa bab bae bah ban bao bar bat bba bbb bbe bbh bbn bbo bbr bbt be- bea beb bee beh ben beo ber bet bha bhb bhe bhh bho bhr bht bna bnb bne bnn bno bnr bnt boa bob boe boh bon boo bor bot bra brb bre brh brn bro brr brt bta btb bte bth btn bto btr btt eaa eab eae eah ean eao ear eat eba ebb ebe ebh ebn ebo ebr ebt eea eeb eee een eeo eer eet eha ehb ehe ehh ehn eho ehr eht en- ena enb ene enh enn eno enr ent eo- eoa eob eoe eoh eon eoo eor eot era erb ere erh ern ero err ert eta etb ete eth etn eto etr ett haa hab hae hah han hao har hat hba hbb hbe hbh hbn hbo hbr hbt he- hea heb hee heh hen heo her het hha hhb hhe hhh hhn hho hhr hht hna hnb hne hnh hnn hno hnt hoa hob hoe hoh hon hoo hor hot hr- hra hrb hre hrh hrn hro hrr hrt hta htb hte hth htn hto htr htt naa nab nae nah nan nao nar nat nba nbb nbe nbn nbo nbr nbt ne- nea neb nee neh nen neo ner net nha nhb nhe nhh nhn nhr nht nna nnb nne nnh nnn nno nnt no- noa nob noe noh non noo nor not nra nrb nre nrn nro nrr nrt nta ntb nte nth ntn nto ntr ntt oaa oab oae oah oan oao oar oat ob- oba obb obe obh obn obo obr obt oea oeb oee oeh oen oeo oer oet oha ohe ohh ohn oho ohr oht on- ona onb one onh onn ono onr ont oo- ooa oob ooh oon ooo oor oot or- ora orb ore orh orn oro orr ort ot- ota otb ote oth otn oto otr ott ra- raa rab rae rah ran rao rar rat rba rbb rbe rbh rbn rbo rbr rbt re- rea reb ree reh ren reo rer ret rh- rha rhb rhe rhh rhn rho rhr rht rna rnb rnh rnn rno rnr rnt roa rob roe roh ron roo ror rot rra rrb rrh rrn rrr rrt rta rtb rte rtn rto rtr rtt taa tab tae tah tan tao tar tat tba tbb tbe tbh tbn tbo tbr tbt te- tea teb tee teh ten teo ter tet th- tha thb the thh thn tho thr tht tna tnb tne tnh tnn tno tnr tnt to- toa tob toe toh ton too tor tot tra trb tre trh trn tro trr trt tta ttb tte tth ttn tto ttr ttt