-ic a-a a-b a-c a-i aaa aab aac aah aai aao aas ab- aba abb abc abh abi abo abs ac- aca acb acc ach aci aco acs aha ahb ahc ahh ahi aho ahs ai- aia aib aic aih aii aio ais aoa aob aoc aoh aoi aoo aos as- asa asb asc ash asi aso ass baa bab bac bah bai bao bas bba bbb bbc bbh bbi bbo bbs bca bcb bcc bch bci bco bcs bha bhb bhc bhh bhi bho bhs bi- bia bib bic bih bii bio bis boa bob boc boh boi boo bos bsa bsb bsc bsh bsi bso bss c-- caa cab cac cah cai cao cas cba cbb cbc cbh cbi cbo cbs cca ccb ccc cch cci cco ccs ch- cha chb chc chh chi cho chs ci- cia cib cic cih cii cio cis co- coa cob coc coh coi coo cos csa csb csc csh csi cso css h-i haa hab hac hah hai hao has hba hbb hbc hbh hbi hbo hbs hca hcb hcc hch hci hco hcs hha hhb hhc hhh hhi hho hhs hia hib hic hih hii hio his hoa hob hoc hoh hoi hoo hos hsa hsb hsc hsh hsi hss ia- iaa iab iac iah iai iao ias iba ibb ibc ibh ibi ibo ibs ica icb icc ich ici ico ics iha ihb ihc ihh ihi iho ihs iia iib iic iih iii iio iis io- ioa iob ioc ioh ioi ioo ios is- isa isb isc ish isi iso iss o-i oaa oab oac oah oai oao oas ob- oba obb obc obh obi obo obs oc- oca ocb occ och oci oco ocs oha ohc ohh ohi oho ohs oia oib oic oii oio ois oo- ooa oob ooc ooh ooi ooo oos os- osa osb osc osh osi oso oss saa sab sac sah sai sao sas sba sbb sbc sbh sbi sbo sbs sca scb scc sch sci sco scs sh- sha shb shc shh shi sho shs sia sib sic sih sii sio sis soa sob soc soh soi soo sos ss- ssa ssb ssc ssh ssi sso sss