-er -th a-a a-b a-c a-t aaa aab aac aae aah aao aar aat ab- aba abb abc abe abh abo abr abt ac- aca acb acc ace ach aco acr act aea aeb aec aee aeh aeo aer aet aha ahb ahc ahe ahh aho ahr aht aoa aob aoc aoe aoh aoo aor aot ar- ara arb arc are arh aro arr art at- ata atb atc ate ath ato atr att baa bab bac bae bah bao bar bat bba bbb bbc bbe bbh bbo bbr bbt bca bcb bcc bce bch bco bcr bct be- bea beb bec bee beh beo ber bet bha bhb bhc bhe bhh bho bhr bht boa bob boc boe boh boo bor bot bra brb bre brh bro brr brt bta btb btc bte bth bto btr btt c-- caa cab cac cae cah cao car cat cba cbb cbc cbe cbh cbo cbr cbt cca ccb ccc cce cch cco ccr cct ce- cea ceb cec cee ceh ceo cer cet ch- cha chb chc che chh cho chr cht co- coa cob coc coe coh coo cor cot cra crb crc cre crh cro crr crt cta ctb ctc cte cth cto ctr ctt eaa eab eac eae eah eao ear eat eba ebb ebc ebe ebh ebo ebr ebt ec- eca ecb ecc ece ech eco ecr ect eea eeb eec eee eeo eer eet eha ehb ehc ehe ehh eho ehr eht eo- eoa eob eoc eoe eoh eoo eor eot era erb erc ere erh ero err ert eta etb etc ete eth eto etr ett haa hab hac hae hah hao har hat hba hbb hbc hbe hbh hbo hbr hbt hca hcb hcc hce hch hco hcr hct he- hea heb hec hee heh heo her het hha hhb hhc hhe hhh hho hhr hht hoa hob hoc hoe hoh hoo hor hot hr- hra hrb hrc hre hrh hro hrr hrt hta htb htc hte hth hto htr htt oaa oab oac oae oah oao oar oat ob- oba obb obc obe obh obo obr obt oc- oca ocb occ och oco ocr oct oea oeb oec oee oeh oeo oer oet oha ohc ohe ohh oho ohr oht oo- ooa oob ooc ooh ooo oor oot or- ora orb orc ore orh oro orr ort ot- ota otb otc ote oth oto otr ott ra- raa rab rac rae rah rao rar rat rba rbb rbc rbe rbh rbo rbr rbt rca rcb rcc rce rch rco rcr rct re- rea reb rec ree reh reo rer ret rh- rha rhb rhc rhe rhh rho rhr rht roa rob roc roe roh roo ror rot rra rrb rrc rrh rrr rrt rta rtb rtc rte rto rtr rtt taa tab tac tae tah tao tar tat tba tbb tbc tbe tbh tbo tbr tbt tca tcb tcc tce tch tco tcr tct te- tea teb tec tee teh teo ter tet th- tha thb thc the thh tho thr tht to- toa tob toc toe toh too tor tot tra trb trc tre trh tro trr trt tta ttb ttc tte tth tto ttr ttt