-ic a-a a-b a-c a-i aaa aab aac aaf aah aai aao aar aas ab- aba abb abc abf abh abi abo abr abs ac- aca acb acc acf ach aci aco acr acs af- afa afb afc aff afh afi afo afr afs aha ahb ahc ahf ahh ahi aho ahr ahs ai- aia aib aic aif aih aii aio air ais aoa aob aoc aof aoh aoi aoo aor aos ar- ara arb arc arf arh ari aro arr ars as- asa asb asc asf ash asi aso asr ass baa bab bac baf bah bai bao bar bas bba bbb bbc bbf bbh bbi bbo bbr bbs bca bcb bcc bcf bch bci bco bcr bcs bfa bfb bfc bff bfh bfi bfo bfr bfs bha bhb bhc bhf bhh bhi bho bhr bhs bi- bia bib bic bif bih bii bio bir bis boa bob boc bof boh boi boo bor bos bra brb brf brh bri bro brr brs bsa bsb bsc bsf bsh bsi bso bsr bss c-- caa cab cac caf cah cai cao car cas cba cbb cbc cbf cbh cbi cbo cbr cbs cca ccb ccc ccf cch cci cco ccr ccs cfa cfb cfc cff cfh cfi cfo cfr cfs ch- cha chb chc chf chh chi cho chr chs ci- cia cib cic cif cih cii cio cir cis co- coa cob coc cof coh coi coo cor cos cra crb crc crf crh cri cro crr crs csa csb csc csf csh csi cso csr css faa fab fac faf fah fai fao far fas fba fbb fbc fbf fbh fbi fbo fbr fbs fca fcb fcc fcf fci fco fcr fcs ffa ffc fff ffh ffi ffo ffr ffs fha fhb fhc fhf fhh fhi fho fhr fhs fia fib fic fif fih fii fir fis foa fob foc fof foh foi foo for fos fra frb frc frf frh fri fro frr frs fsa fsb fsc fsf fsh fsi fso fsr fss h-i haa hab hac haf hah hai hao har has hba hbb hbc hbf hbh hbi hbo hbr hbs hca hcb hcc hcf hch hci hco hcr hcs hfa hfb hfc hff hfh hfi hfo hfr hfs hha hhb hhc hhf hhh hhi hho hhr hhs hia hib hic hif hih hii hio hir his hoa hob hoc hof hoh hoi hoo hor hos hr- hra hrb hrc hrf hrh hri hro hrr hrs hsa hsb hsc hsf hsh hsi hsr hss i-f ia- iaa iab iac iaf iah iai iao iar ias iba ibb ibc ibf ibh ibi ibo ibr ibs ica icb icc icf ich ici ico icr ics ifa ifb ifc iff ifi ifo ifr ifs iha ihb ihc ihf ihh ihi iho ihr ihs iia iib iic iif iih iii iio iir iis io- ioa iob ioc iof ioh ioi ioo ior ios ir- ira irb irc irf iri iro irr irs is- isa isb isc isf ish isi iso isr iss o-i oaa oab oac oaf oah oai oao oar oas ob- oba obb obc obf obh obi obo obr obs oc- oca ocb occ ocf och oci oco ocr ocs of- ofa ofb ofc off ofi ofo ofr ofs oha ohc ohf ohh ohi oho ohr ohs oia oib oic oif oii oio oir ois oo- ooa oob ooc oof ooh ooi ooo oor oos or- ora orb orc orf orh ori oro orr ors os- osa osb osc osf osh osi oso osr oss ra- raa rab rac raf rah rai rao rar ras rba rbb rbc rbf rbh rbi rbo rbr rbs rca rcb rcc rcf rch rci rco rcr rcs rfa rfb rfc rff rfh rfi rfo rfr rfs rh- rha rhb rhc rhf rhh rhi rho rhr rhs ria rib ric rif rih rii rio rir ris roa rob roc rof roh roi roo ror ros rra rrb rrc rrf rrh rri rrr rrs rsa rsb rsc rsf rsh rsi rso rsr rss saa sab sac saf sah sai sao sar sas sba sbb sbc sbf sbh sbi sbo sbr sbs sca scb scc scf sch sci sco scr scs sfa sfb sfc sff sfh sfi sfo sfr sfs sh- sha shb shc shf shh shi sho shr shs sia sib sic sif sih sii sio sir sis soa sob soc sof soh soi soo sor sos sr- sra srb src srf srh sri sro srr srs ss- ssa ssb ssc ssf ssh ssi sso ssr sss