a-a a-b a-c a-t aaa aab aac aae aaj aak aao aat ab- aba abb abc abe abj abk abo abt ac- aca acb acc ace acj ack aco act aea aeb aec aee aej aek aeo aet aja ajb ajc aje ajj ajk ajo ajt aka akb akc ake akj akk ako aoa aob aoc aoe aoj aok aoo aot at- ata atb atc ate ato att baa bab bac bae baj bak bao bat bba bbb bbc bbe bbk bbo bbt bca bcb bcc bce bcj bck bco bct be- bea beb bec bee bek beo bet bja bjc bjj bjk bjt bka bkb bkc bke bkk bko bkt boa bob boc boe boj bok boo bot bta btb btc bte btk bto btt c-- c-j caa cab cac cae caj cak cao cat cba cbb cbc cbe cbj cbk cbo cbt cca ccb ccc cce ccj cck cco cct ce- cea ceb cec cee cej cek ceo cet cja cjb cjc cjk cka ckb ckc cko ckt co- coa cob coc coe coj cok coo cot cta ctb ctc cte ctk cto ctt eaa eab eac eae eaj eak eao eat eba ebb ebc ebe ebj ebk ebo ebt ec- eca ecb ecc ece ecj eck eco ect eea eeb eec eee eek eeo eet eja ejc ejo ejt eka ekb ekc eke eko ekt eo- eoa eob eoc eoe eok eoo eot eta etb etc ete etj etk eto ett jaa jab jac jae jaj jak jao jat jba jbc jbj jbk jbo jbt jca jcb jcc jce jck jco jct jea jeb jec jee jej jek jeo jet jja jjb jjc jjj jjk jka jkb jkk jko jkt joa job joc joe joj jok joo jot jta jtb jtc jte jtk jtt k-t ka- kaa kab kac kae kaj kak kao kat kba kbb kbc kbe kbk kbo kca kcb kcc kce kck kct ke- kea keb kec kee kek keo ket kjb kjc kje kkb kkc kke kkk kkt koa kob koc koe kok koo kot kta ktb ktc kte ktj ktk kto ktt oaa oab oac oae oaj oak oao oat ob- oba obb obc obe obj obk obo obt oc- oca ocb occ ocj ock oco oct oea oeb oec oee oeo oet oja ojb ojc oje ojo oka okb okc oke okj okk oko oo- ooa oob ooc ook ooo oot ot- ota otb otc ote otk oto ott taa tab tac tae taj tak tao tat tba tbb tbc tbe tbj tbk tbo tbt tca tcb tcc tce tcj tck tco tct te- tea teb tec tee tej tek teo tet tjc tje tjo tka tkb tkc tke tkk tko tkt to- toa tob toc toe toj tok too tot tta ttb ttc tte ttk tto ttt