-er a-a a-b a-c aaa aab aac aae aaj aak aam aar ab- aba abb abc abe abj abk abm abr ac- aca acb acc ace acj ack acm acr aea aeb aec aee aej aek aem aer aja ajb ajc aje ajj ajk ajm ajr aka akb akc ake akj akk akm akr ama amb amc ame amk amm amr ar- ara arb arc are arj ark arm arr baa bab bac bae baj bak bam bar bba bbb bbc bbe bbk bbm bbr bca bcb bcc bce bcj bck bcm bcr be- bea beb bec bee bek bem ber bja bjc bjj bjk bjm bjr bka bkb bkc bke bkk bkm bkr bma bmb bmc bme bmj bmk bmm bmr bra brb bre brj brk brm brr c-- c-j caa cab cac cae caj cak cam car cba cbb cbc cbe cbj cbk cbm cbr cca ccb ccc cce ccj cck ccm ccr ce- cea ceb cec cee cej cek cem cer cja cjb cjc cjk cjr cka ckb ckc ckm cma cmb cmc cme cmj cmk cmm cmr cra crb crc cre crj crk crm crr eaa eab eac eae eaj eak eam ear eba ebb ebc ebe ebj ebk ebm ebr ec- eca ecb ecc ece ecj eck ecm ecr eea eeb eec eee eek eem eer eja ejc eka ekb ekc eke ekr em- ema emb emc eme emk emm emr era erb erc ere erk erm err jaa jab jac jae jaj jak jam jar jba jbc jbj jbk jbm jbr jca jcb jcc jce jck jcm jcr jea jeb jec jee jej jek jem jer jja jjb jjc jjj jjk jjr jka jkb jkk jkm jkr jma jmb jmc jme jmj jmm jmr jra jrb jrc jrk jrm jrr ka- kaa kab kac kae kaj kak kam kar kba kbb kbc kbe kbk kbm kbr kca kcb kcc kce kck kcm kcr ke- kea keb kec kee kek kem ker kjb kjc kje kjr kkb kkc kke kkk kkm kkr kma kmb kmc kme kmj kmk kmm kra krc krk krr m-r maa mab mac mae maj mak mam mar mba mbb mbc mbe mbj mbk mbm mbr mc- mca mcb mcc mce mck mcm mcr mea meb mec mee mej mek mem mer mjb mjc mje mjj mjk mjm mjr mka mkb mkc mke mkk mkm mkr mma mmb mmc mme mmj mmk mmm mmr mra mrb mrc mre mrj mrk mrm mrr ra- raa rab rac rae raj rak ram rar rba rbb rbc rbe rbk rbm rbr rca rcb rcc rce rcj rcm rcr re- rea reb rec ree rek rem rer rja rjc rjk rjm rjr rkb rkc rke rkk rkm rma rmb rmc rme rmm rmr rra rrb rrc rrk rrm rrr