-ic a-a a-b a-c a-i aaa aab aac aae aah aai aak aas ab- aba abb abc abe abh abi abk abs ac- aca acb acc ace ach aci ack acs aea aeb aec aee aeh aei aek aes aha ahb ahc ahe ahh ahi ahk ahs ai- aia aib aic aie aih aii aik ais aka akb akc ake akh aki akk aks as- asa asb asc ase ash asi ask ass baa bab bac bae bah bai bak bas bba bbb bbc bbe bbh bbi bbk bbs bca bcb bcc bce bch bci bck bcs be- bea beb bec bee beh bei bek bes bha bhb bhc bhe bhh bhi bhk bhs bi- bia bib bic bie bih bii bik bis bka bkb bkc bke bkk bks bsa bsb bsc bse bsh bsi bsk bss c-- caa cab cac cae cah cai cak cas cba cbb cbc cbe cbh cbi cbk cbs cca ccb ccc cce cch cci cck ccs ce- cea ceb cec cee ceh cei cek ces ch- cha chb chc che chh chi chk chs ci- cia cib cic cie cih cii cik cis cka ckb ckc ckh cki cks csa csb csc cse csh csi csk css eaa eab eac eae eah eai eak eas eba ebb ebc ebe ebh ebi ebk ebs ec- eca ecb ecc ece ech eci eck ecs eea eeb eec eee eek ees eha ehb ehc ehe ehh ehi ehs eia eib eic eie eii eik eis eka ekb ekc eke ekh eki eks es- esa esb esc ese esh esi esk ess h-i haa hab hac hae hah hai hak has hba hbb hbc hbe hbh hbi hbk hbs hca hcb hcc hce hch hci hck hcs he- hea heb hec hee heh hei hek hes hha hhb hhc hhe hhh hhi hhk hhs hia hib hic hie hih hii hik his hka hkb hkh hki hkk hks hsa hsb hsc hse hsh hsi hsk hss ia- iaa iab iac iae iah iai ias iba ibb ibc ibe ibh ibi ibk ibs ica icb icc ice ich ici ick ics ie- iea iec iee iei iek ies iha ihb ihc ihe ihh ihi ihk ihs iia iib iic iie iih iii iis ika ikb ikc ike iki ikk iks is- isa isb isc ise ish isi isk iss ka- kaa kab kac kae kah kai kak kas kba kbb kbc kbe kbh kbi kbk kbs kca kcb kcc kce kch kci kck kcs ke- kea keb kec kee keh kei kek kes kha khe khh khi khk khs kia kib kic kie kih kii kik kis kkb kkc kke kkh kki kkk kks ksa ksb ksc kse ksh ksi ksk kss saa sab sac sae sah sai sak sas sba sbb sbc sbe sbh sbi sbk sbs sca scb scc sce sch sci sck scs se- sea seb sec see seh sei sek ses sh- sha shb shc she shh shi shk shs sia sib sic sie sih sii sik sis sk- ska skb skc ske skh ski skk sks ss- ssa ssb ssc sse ssh ssi ssk sss