-ic a-a a-b a-c a-i aaa aab aac aah aai aao aar aas ab- aba abb abc abh abi abo abr abs ac- aca acb acc ach aci aco acr acs aha ahb ahc ahh ahi aho ahr ahs ai- aia aib aic aih aii aio air ais aoa aob aoc aoh aoi aoo aor aos ar- ara arb arc arh ari aro arr ars as- asa asb asc ash asi aso asr ass baa bab bac bah bai bao bar bas bba bbb bbc bbh bbi bbo bbr bbs bca bcb bcc bch bci bco bcr bcs bha bhb bhc bhh bhi bho bhr bhs bi- bia bib bic bih bii bio bir bis boa bob boc boh boi boo bor bos bra brb brh bri bro brr brs bsa bsb bsc bsh bsi bso bsr bss c-- caa cab cac cah cai cao car cas cba cbb cbc cbh cbi cbo cbr cbs cca ccb ccc cch cci cco ccr ccs ch- cha chb chc chh chi cho chr chs ci- cia cib cic cih cii cio cir cis co- coa cob coc coh coi coo cor cos cra crb crc crh cri cro crr crs csa csb csc csh csi cso csr css h-i haa hab hac hah hai hao har has hba hbb hbc hbh hbi hbo hbr hbs hca hcb hcc hch hci hco hcr hcs hha hhb hhc hhh hhi hho hhr hhs hia hib hic hih hii hio hir his hoa hob hoc hoh hoi hoo hor hos hr- hra hrb hrc hrh hri hro hrr hrs hsa hsb hsc hsh hsi hsr hss ia- iaa iab iac iah iai iao iar ias iba ibb ibc ibh ibi ibo ibr ibs ica icb icc ich ici ico icr ics iha ihb ihc ihh ihi iho ihr ihs iia iib iic iih iii iio iir iis io- ioa iob ioc ioh ioi ioo ior ios ir- ira irb irc iri iro irr irs is- isa isb isc ish isi iso isr iss o-i oaa oab oac oah oai oao oar oas ob- oba obb obc obh obi obo obr obs oc- oca ocb occ och oci oco ocr ocs oha ohc ohh ohi oho ohr ohs oia oib oic oii oio oir ois oo- ooa oob ooc ooh ooi ooo oor oos or- ora orb orc orh ori oro orr ors os- osa osb osc osh osi oso osr oss ra- raa rab rac rah rai rao rar ras rba rbb rbc rbh rbi rbo rbr rbs rca rcb rcc rch rci rco rcr rcs rh- rha rhb rhc rhh rhi rho rhr rhs ria rib ric rih rii rio rir ris roa rob roc roh roi roo ror ros rra rrb rrc rrh rri rrr rrs rsa rsb rsc rsh rsi rso rsr rss saa sab sac sah sai sao sar sas sba sbb sbc sbh sbi sbo sbr sbs sca scb scc sch sci sco scr scs sh- sha shb shc shh shi sho shr shs sia sib sic sih sii sio sir sis soa sob soc soh soi soo sor sos sr- sra srb src srh sri sro srr srs ss- ssa ssb ssc ssh ssi sso ssr sss