-er a-a a-b a-c aaa aab aac aae aaj aan aar ab- aba abb abc abe abj abn abr ac- aca acb acc ace acj acn acr aea aeb aec aee aej aen aer aja ajb ajc aje ajj ajn ajr an- ana anb anc ane anj ann anr ar- ara arb arc are arj arn arr baa bab bac bae baj ban bar bba bbb bbc bbe bbn bbr bca bcb bcc bce bcj bcn bcr be- bea beb bec bee ben ber bja bjc bjj bjn bjr bna bnb bnc bne bnj bnn bnr bra brb bre brj brn brr c-- c-j caa cab cac cae caj can car cba cbb cbc cbe cbj cbn cbr cca ccb ccc cce ccj ccn ccr ce- cea ceb cec cee cej cen cer cja cjb cjc cjr cn- cna cnb cnc cne cnj cnn cnr cra crb crc cre crj crn crr eaa eab eac eae eaj ean ear eba ebb ebc ebe ebj ebn ebr ec- eca ecb ecc ece ecj ecn ecr eea eeb eec eee een eer eja ejc en- ena enb enc ene enn enr era erb erc ere ern err jaa jab jac jae jaj jan jar jba jbc jbj jbr jca jcb jcc jce jcr jea jeb jec jee jej jen jer jja jjb jjc jjj jjr jna jnc jne jnj jnn jnr jra jrb jrc jrn jrr naa nab nac nae naj nan nar nba nbb nbc nbe nbn nbr nca ncb ncc nce ncn ncr ne- nea neb nec nee nej nen ner nja njc nje njn nna nnb nnc nne nnn nra nrb nrc nre nrj nrn nrr ra- raa rab rac rae raj ran rar rba rbb rbc rbe rbn rbr rca rcb rcc rce rcj rcn rcr re- rea reb rec ree ren rer rja rjc rjr rna rnb rnc rnn rnr rra rrb rrc rrn rrr