-ic a-a a-b a-c a-i aaa aab aac aai aan aas aay ab- aba abb abc abi abn abs aby ac- aca acb acc aci acn acs acy ai- aia aib aic aii ain ais aiy an- ana anb anc ani ann ans any as- asa asb asc asi asn ass asy ay- aya ayc ayi ayn ays baa bab bac bai ban bas bay bba bbb bbc bbi bbn bbs bby bca bcb bcc bci bcn bcs bcy bi- bia bib bic bii bin bis biy bna bnb bnc bni bnn bns bsa bsb bsc bsi bsn bss bsy by- bya byc byi byn bys c-- caa cab cac cai can cas cay cba cbb cbc cbi cbn cbs cby cca ccb ccc cci ccn ccs ci- cia cib cic cii cin cis cn- cna cnb cnc cni cnn cns cny csa csb csc csi csn css csy cya cyb cyc cyn cys ia- iaa iab iac iai ian ias iba ibb ibc ibi ibn ibs iby ica icb icc ici icn ics icy iia iib iic iii iin iis in- ina inb inc ini inn ins iny is- isa isb isc isi isn iss isy iya iyc iys iyy n-i naa nab nac nai nan nas nay nba nbb nbc nbi nbn nbs nca ncb ncc nci ncn ncs nia nib nic nii nin nis nna nnb nnc nni nnn nns nsa nsb nsc nsi nsn nss nsy nya nyc nyn nys nyy saa sab sac sai san sas say sba sbb sbc sbi sbn sbs sby sca scb scc sci scn scs sia sib sic sii sin sis sna snb snc sni snn sns sny ss- ssa ssb ssc ssi ssn sss sy- sya syb syc syi syn sys yaa yab yac yai yan yas yay ybc ybi ybs yby yca ycc yci ycs ycy yii yin yis yna ynn yns yny ysa ysb ysc ysi yss ysy yyb yyc yys yyy