-ic a-a a-b a-c a-i aaa aab aac aad aai aao aar aas ab- aba abb abc abd abi abo abr abs ac- aca acb acc acd aci aco acr acs ad- ada adb adc add adi ado adr ads ai- aia aib aic aid aii aio air ais aoa aob aoc aod aoi aoo aor aos ar- ara arb arc ard ari aro arr ars as- asa asb asc asd asi aso asr ass baa bab bac bad bai bao bar bas bba bbb bbc bbd bbi bbo bbr bbs bca bcb bcc bcd bci bco bcr bcs bda bdb bdc bdd bdi bdo bdr bds bi- bia bib bic bid bii bio bir bis boa bob boc bod boi boo bor bos bra brb brd bri bro brr brs bsa bsb bsc bsd bsi bso bsr bss c-- caa cab cac cad cai cao car cas cba cbb cbc cbd cbi cbo cbr cbs cca ccb ccc ccd cci cco ccr ccs cda cdb cdc cdd cdi cdo cdr cds ci- cia cib cic cid cii cio cir cis co- coa cob coc cod coi coo cor cos cra crb crc crd cri cro crr crs csa csb csc csd csi cso csr css daa dab dac dad dai dao dar das dba dbb dbc dbd dbi dbo dbr dbs dca dcb dcc dcd dci dco dcr dcs dda ddb ddc ddd ddi ddo ddr dds di- dia dib dic did dii dio dir dis doa dob doc dod doi doo dor dos dra drb drc drd dri dro drr drs dsa dsb dsc dsd dsi dso dsr dss i-d ia- iaa iab iac iad iai iao iar ias iba ibb ibc ibd ibi ibo ibr ibs ica icb icc icd ici ico icr ics ida idb idc idd idi ido idr ids iia iib iic iid iii iio iir iis io- ioa iob ioc iod ioi ioo ior ios ir- ira irb irc ird iri iro irr irs is- isa isb isc isd isi iso isr iss o-i oaa oab oac oad oai oao oar oas ob- oba obb obc obd obi obo obr obs oc- oca ocb occ ocd oci oco ocr ocs oda odb odc odd odi odo odr ods oia oib oic oid oii oio oir ois oo- ooa oob ooc ood ooi ooo oor oos or- ora orb orc ord ori oro orr ors os- osa osb osc osd osi oso osr oss ra- raa rab rac rad rai rao rar ras rba rbb rbc rbd rbi rbo rbr rbs rca rcb rcc rcd rci rco rcr rcs rda rdb rdc rdd rdi rdo rdr rds ria rib ric rid rii rio rir ris roa rob roc rod roi roo ror ros rra rrb rrc rrd rri rrr rrs rsa rsb rsc rsd rsi rso rsr rss saa sab sac sad sai sao sar sas sba sbb sbc sbd sbi sbo sbr sbs sca scb scc scd sci sco scr scs sda sdb sdc sdd sdi sdo sdr sds sia sib sic sid sii sio sir sis soa sob soc sod soi soo sor sos sr- sra srb src srd sri sro srr srs ss- ssa ssb ssc ssd ssi sso ssr sss