-er -th a-a a-b a-c a-t aaa aab aac aae aah aak aao aar aat ab- aba abb abc abe abh abk abo abr abt ac- aca acb acc ace ach ack aco acr act aea aeb aec aee aeh aek aeo aer aet aha ahb ahc ahe ahh ahk aho ahr aht aka akb akc ake akh akk ako akr aoa aob aoc aoe aoh aok aoo aor aot ar- ara arb arc are arh ark aro arr art at- ata atb atc ate ath ato atr att baa bab bac bae bah bak bao bar bat bba bbb bbc bbe bbh bbk bbo bbr bbt bca bcb bcc bce bch bck bco bcr bct be- bea beb bec bee beh bek beo ber bet bha bhb bhc bhe bhh bhk bho bhr bht bka bkb bkc bke bkk bko bkr bkt boa bob boc boe boh bok boo bor bot bra brb bre brh brk bro brr brt bta btb btc bte bth btk bto btr btt c-- caa cab cac cae cah cak cao car cat cba cbb cbc cbe cbh cbk cbo cbr cbt cca ccb ccc cce cch cck cco ccr cct ce- cea ceb cec cee ceh cek ceo cer cet ch- cha chb chc che chh chk cho chr cht cka ckb ckc ckh cko ckt co- coa cob coc coe coh cok coo cor cot cra crb crc cre crh crk cro crr crt cta ctb ctc cte cth ctk cto ctr ctt eaa eab eac eae eah eak eao ear eat eba ebb ebc ebe ebh ebk ebo ebr ebt ec- eca ecb ecc ece ech eck eco ecr ect eea eeb eec eee eek eeo eer eet eha ehb ehc ehe ehh eho ehr eht eka ekb ekc eke ekh eko ekr ekt eo- eoa eob eoc eoe eoh eok eoo eor eot era erb erc ere erh erk ero err ert eta etb etc ete eth etk eto etr ett haa hab hac hae hah hak hao har hat hba hbb hbc hbe hbh hbk hbo hbr hbt hca hcb hcc hce hch hck hco hcr hct he- hea heb hec hee heh hek heo her het hha hhb hhc hhe hhh hhk hho hhr hht hka hkb hkh hkk hko hkr hkt hoa hob hoc hoe hoh hok hoo hor hot hr- hra hrb hrc hre hrh hrk hro hrr hrt hta htb htc hte hth htk hto htr htt k-t ka- kaa kab kac kae kah kak kao kar kat kba kbb kbc kbe kbh kbk kbo kbr kca kcb kcc kce kch kck kcr kct ke- kea keb kec kee keh kek keo ker ket kha khe khh khk kho khr kkb kkc kke kkh kkk kkr kkt koa kob koc koe koh kok koo kor kot kra krc krk kro krr krt kta ktb ktc kte kth ktk kto ktr ktt oaa oab oac oae oah oak oao oar oat ob- oba obb obc obe obh obk obo obr obt oc- oca ocb occ och ock oco ocr oct oea oeb oec oee oeh oeo oer oet oha ohc ohe ohh oho ohr oht oka okb okc oke okk oko okr oo- ooa oob ooc ooh ook ooo oor oot or- ora orb orc ore orh ork oro orr ort ot- ota otb otc ote oth otk oto otr ott ra- raa rab rac rae rah rak rao rar rat rba rbb rbc rbe rbh rbk rbo rbr rbt rca rcb rcc rce rch rco rcr rct re- rea reb rec ree reh rek reo rer ret rh- rha rhb rhc rhe rhh rho rhr rht rkb rkc rke rkk rko rkt roa rob roc roe roh rok roo ror rot rra rrb rrc rrh rrk rrr rrt rta rtb rtc rte rtk rto rtr rtt taa tab tac tae tah tak tao tar tat tba tbb tbc tbe tbh tbk tbo tbr tbt tca tcb tcc tce tch tck tco tcr tct te- tea teb tec tee teh tek teo ter tet th- tha thb thc the thh thk tho thr tht tka tkb tkc tke tkk tko tkr tkt to- toa tob toc toe toh tok too tor tot tra trb trc tre trh trk tro trr trt tta ttb ttc tte tth ttk tto ttr ttt