-ic a-a a-b a-c a-i aaa aab aac aaf aah aai aas ab- aba abb abc abf abh abi abs ac- aca acb acc acf ach aci acs af- afa afb afc aff afh afi afs aha ahb ahc ahf ahh ahi ahs ai- aia aib aic aif aih aii ais as- asa asb asc asf ash asi ass baa bab bac baf bah bai bas bba bbb bbc bbf bbh bbi bbs bca bcb bcc bcf bch bci bcs bfa bfb bfc bff bfh bfi bfs bha bhb bhc bhf bhh bhi bhs bi- bia bib bic bif bih bii bis bsa bsb bsc bsf bsh bsi bss c-- caa cab cac caf cah cai cas cba cbb cbc cbf cbh cbi cbs cca ccb ccc ccf cch cci ccs cfa cfb cfc cff cfh cfi cfs ch- cha chb chc chf chh chi chs ci- cia cib cic cif cih cii cis csa csb csc csf csh csi css faa fab fac faf fah fai fas fba fbb fbc fbf fbh fbi fbs fca fcb fcc fcf fci fcs ffa ffc fff ffh ffi ffs fha fhb fhc fhf fhh fhi fhs fia fib fic fif fih fii fis fsa fsb fsc fsf fsh fsi fss h-i haa hab hac haf hah hai has hba hbb hbc hbf hbh hbi hbs hca hcb hcc hcf hch hci hcs hfa hfb hfc hff hfh hfi hfs hha hhb hhc hhf hhh hhi hhs hia hib hic hif hih hii his hsa hsb hsc hsf hsh hsi hss i-f ia- iaa iab iac iaf iah iai ias iba ibb ibc ibf ibh ibi ibs ica icb icc icf ich ici ics ifa ifb ifc iff ifi ifs iha ihb ihc ihf ihh ihi ihs iia iib iic iif iih iii iis is- isa isb isc isf ish isi iss saa sab sac saf sah sai sas sba sbb sbc sbf sbh sbi sbs sca scb scc scf sch sci scs sfa sfb sfc sff sfh sfi sfs sh- sha shb shc shf shh shi shs sia sib sic sif sih sii sis ss- ssa ssb ssc ssf ssh ssi sss