-er a-a a-c aaa aac aae aaf aaj aak aar ac- aca acc ace acf acj ack acr aea aec aee aef aej aek aer af- afa afc afe aff afj afk afr aja ajc aje ajf ajj ajk ajr aka akc ake akj akk akr ar- ara arc are arf arj ark arr c-- c-j caa cac cae caf caj cak car cca ccc cce ccf ccj cck ccr ce- cea cec cee cef cej cek cer cfa cfc cfe cff cfk cfr cja cjc cjf cjk cjr cka ckc cra crc cre crf crj crk crr eaa eac eae eaf eaj eak ear ec- eca ecc ece ecf ecj eck ecr eea eec eee eef eek eer ef- efa efc efe eff efr eja ejc ejf eka ekc eke ekf ekr era erc ere erf erk err faa fac fae faf faj fak far fca fcc fce fcf fcj fck fcr fea fec fee fef fek fer ffa ffc ffe fff ffk ffr fja fjc fka fkc fkf fkj fkk fra frc fre frf frj frk frr jaa jac jae jaf jaj jak jar jca jcc jce jcf jck jcr jea jec jee jef jej jek jer jfa jfc jfe jff jfj jfk jfr jja jjc jjf jjj jjk jjr jka jkk jkr jra jrc jrf jrk jrr ka- kaa kac kae kaf kaj kak kar kca kcc kce kck kcr ke- kea kec kee kef kek ker kfa kfc kff kjc kje kjr kkc kke kkk kkr kra krc krf krk krr ra- raa rac rae raf raj rak rar rca rcc rce rcf rcj rcr re- rea rec ree ref rek rer rfa rfc rfe rff rfj rfk rfr rja rjc rjf rjk rjr rkc rke rkf rkk rra rrc rrf rrk rrr