-ic a-a a-b a-c a-i aaa aab aac aah aai aas aay ab- aba abb abc abh abi abs aby ac- aca acb acc ach aci acs acy aha ahb ahc ahh ahi ahs ahy ai- aia aib aic aih aii ais aiy as- asa asb asc ash asi ass asy ay- aya ayc ayh ayi ays baa bab bac bah bai bas bay bba bbb bbc bbh bbi bbs bby bca bcb bcc bch bci bcs bcy bha bhb bhc bhh bhi bhs bi- bia bib bic bih bii bis biy bsa bsb bsc bsh bsi bss bsy by- bya byc byh byi bys c-- caa cab cac cah cai cas cay cba cbb cbc cbh cbi cbs cby cca ccb ccc cch cci ccs ch- cha chb chc chh chi chs chy ci- cia cib cic cih cii cis csa csb csc csh csi css csy cya cyb cyc cys h-i haa hab hac hah hai has hay hba hbb hbc hbh hbi hbs hby hca hcb hcc hch hci hcs hcy hha hhb hhc hhh hhi hhs hhy hia hib hic hih hii his hsa hsb hsc hsh hsi hss hsy hy- hya hyb hyc hyh hyi hys hyy ia- iaa iab iac iah iai ias iba ibb ibc ibh ibi ibs iby ica icb icc ich ici ics icy iha ihb ihc ihh ihi ihs ihy iia iib iic iih iii iis is- isa isb isc ish isi iss isy iya iyc iys iyy saa sab sac sah sai sas say sba sbb sbc sbh sbi sbs sby sca scb scc sch sci scs sh- sha shb shc shh shi shs shy sia sib sic sih sii sis ss- ssa ssb ssc ssh ssi sss sy- sya syb syc syh syi sys yaa yab yac yah yai yas yay ybc ybi ybs yby yca ycc ych yci ycs ycy yha yhc yhi yhs yih yii yis ysa ysb ysc ysi yss ysy yyb yyc yys yyy