-er a-a a-b a-c a-t aaa aab aac aae aaj aar aat ab- aba abb abc abe abj abr abt ac- aca acb acc ace acj acr act aea aeb aec aee aej aer aet aja ajb ajc aje ajj ajr ajt ar- ara arb arc are arj arr art at- ata atb atc ate atr att baa bab bac bae baj bar bat bba bbb bbc bbe bbr bbt bca bcb bcc bce bcj bcr bct be- bea beb bec bee ber bet bja bjc bjj bjr bjt bra brb bre brj brr brt bta btb btc bte btr btt c-- c-j caa cab cac cae caj car cat cba cbb cbc cbe cbj cbr cbt cca ccb ccc cce ccj ccr cct ce- cea ceb cec cee cej cer cet cja cjb cjc cjr cra crb crc cre crj crr crt cta ctb ctc cte ctr ctt eaa eab eac eae eaj ear eat eba ebb ebc ebe ebj ebr ebt ec- eca ecb ecc ece ecj ecr ect eea eeb eec eee eer eet eja ejc ejt era erb erc ere err ert eta etb etc ete etj etr ett jaa jab jac jae jaj jar jat jba jbc jbj jbr jbt jca jcb jcc jce jcr jct jea jeb jec jee jej jer jet jja jjb jjc jjj jjr jra jrb jrc jrr jrt jta jtb jtc jte jtr jtt ra- raa rab rac rae raj rar rat rba rbb rbc rbe rbr rbt rca rcb rcc rce rcj rcr rct re- rea reb rec ree rer ret rja rjc rjr rra rrb rrc rrr rrt rta rtb rtc rte rtj rtr rtt taa tab tac tae taj tar tat tba tbb tbc tbe tbj tbr tbt tca tcb tcc tce tcj tcr tct te- tea teb tec tee tej ter tet tjc tje tjr tra trb trc tre trr trt tta ttb ttc tte ttr ttt