-er a-a a-b a-c a-t aaa aab aac aae aaj aao aar aat aax ab- aba abb abc abe abj abo abr abt abx ac- aca acb acc ace acj aco acr act acx aea aeb aec aee aej aeo aer aet aex aja ajb ajc aje ajj ajo ajr ajt aoa aob aoc aoe aoj aoo aor aot aox ar- ara arb arc are arj aro arr art arx at- ata atb atc ate ato atr att atx ax- axa axe axj axo axr axt axx baa bab bac bae baj bao bar bat bax bba bbb bbc bbe bbo bbr bbt bbx bca bcb bcc bce bcj bco bcr bct bcx be- bea beb bec bee beo ber bet bex bja bjc bjj bjr bjt boa bob boc boe boj boo bor bot box bra brb bre brj bro brr brt brx bta btb btc bte bto btr btt btx bxb bxj bxo bxx c-- c-j caa cab cac cae caj cao car cat cax cba cbb cbc cbe cbj cbo cbr cbt cbx cca ccb ccc cce ccj cco ccr cct ccx ce- cea ceb cec cee cej ceo cer cet cex cja cjb cjc cjr co- coa cob coc coe coj coo cor cot cox cra crb crc cre crj cro crr crt crx cta ctb ctc cte cto ctr ctt ctx cxc cxj cxo cxr cxt cxx eaa eab eac eae eaj eao ear eat eax eba ebb ebc ebe ebj ebo ebr ebt ebx ec- eca ecb ecc ece ecj eco ecr ect ecx eea eeb eec eee eeo eer eet eex eja ejc ejo ejt eo- eoa eob eoc eoe eoo eor eot era erb erc ere ero err ert eta etb etc ete etj eto etr ett etx ex- exa exc exe exo exr ext exx jaa jab jac jae jaj jao jar jat jax jba jbc jbj jbo jbr jbt jca jcb jcc jce jco jcr jct jea jeb jec jee jej jeo jer jet jja jjb jjc jjj jjr joa job joc joe joj joo jor jot jra jrb jrc jro jrr jrt jta jtb jtc jte jtr jtt oaa oab oac oae oaj oao oar oat oax ob- oba obb obc obe obj obo obr obt obx oc- oca ocb occ ocj oco ocr oct ocx oea oeb oec oee oeo oer oet oex oja ojb ojc oje ojo oo- ooa oob ooc ooo oor oot oox or- ora orb orc ore oro orr ort orx ot- ota otb otc ote oto otr ott ox- oxa oxb oxc oxo oxt oxx ra- raa rab rac rae raj rao rar rat rax rba rbb rbc rbe rbo rbr rbt rbx rca rcb rcc rce rcj rco rcr rct rcx re- rea reb rec ree reo rer ret rex rja rjc rjr roa rob roc roe roj roo ror rot rox rra rrb rrc rrr rrt rta rtb rtc rte rtj rto rtr rtt rtx rxr t-x taa tab tac tae taj tao tar tat tax tba tbb tbc tbe tbj tbo tbr tbt tca tcb tcc tce tcj tco tcr tct tcx te- tea teb tec tee tej teo ter tet tex tjc tje tjo tjr to- toa tob toc toe toj too tor tot tox tra trb trc tre tro trr trt trx tta ttb ttc tte tto ttr ttt ttx txe txt xaa xac xar xat xbc xbe xbr xbx xcb xcr xcx xee xer xet xex xjo xoa xoc xoo xor xot xox xrc xrt xrx xtc xtr xtx xxo xxx