-er a-a a-c a-z aaa aac aae aar aas aaz ac- aca acc ace acr acs acz aea aec aee aer aes aez ar- ara arc are arr ars arz as- asa asc ase asr ass asz az- aza aze azs azz c-- caa cac cae car cas caz cca ccc cce ccr ccs ccz ce- cea cec cee cer ces cez cra crc cre crr crs crz csa csc cse csr css csz cz- czc cze eaa eac eae ear eas eaz ec- eca ecc ece ecr ecs eea eec eee eer ees era erc ere err ers erz es- esa esc ese esr ess eze ezr ezs ezz ra- raa rac rae rar ras raz rca rcc rce rcr rcs re- rea rec ree rer res rez rra rrc rrr rrs rsa rsc rse rsr rss rza rze saa sac sae sar sas saz sca scc sce scr scs se- sea sec see ser ses sez sr- sra src sre srr srs ss- ssa ssc sse ssr sss ssz sza sze szr zaa zac zar zas zaz zce zcs zea zec zee zer zes zez zrs zsa zse zsz zzr zzs zzz