-ic a-a a-b a-c a-i aaa aab aac aad aai aar aas ab- aba abb abc abd abi abr abs ac- aca acb acc acd aci acr acs ad- ada adb adc add adi adr ads ai- aia aib aic aid aii air ais ar- ara arb arc ard ari arr ars as- asa asb asc asd asi asr ass baa bab bac bad bai bar bas bba bbb bbc bbd bbi bbr bbs bca bcb bcc bcd bci bcr bcs bda bdb bdc bdd bdi bdr bds bi- bia bib bic bid bii bir bis bra brb brd bri brr brs bsa bsb bsc bsd bsi bsr bss c-- caa cab cac cad cai car cas cba cbb cbc cbd cbi cbr cbs cca ccb ccc ccd cci ccr ccs cda cdb cdc cdd cdi cdr cds ci- cia cib cic cid cii cir cis cra crb crc crd cri crr crs csa csb csc csd csi csr css daa dab dac dad dai dar das dba dbb dbc dbd dbi dbr dbs dca dcb dcc dcd dci dcr dcs dda ddb ddc ddd ddi ddr dds di- dia dib dic did dii dir dis dra drb drc drd dri drr drs dsa dsb dsc dsd dsi dsr dss i-d ia- iaa iab iac iad iai iar ias iba ibb ibc ibd ibi ibr ibs ica icb icc icd ici icr ics ida idb idc idd idi idr ids iia iib iic iid iii iir iis ir- ira irb irc ird iri irr irs is- isa isb isc isd isi isr iss ra- raa rab rac rad rai rar ras rba rbb rbc rbd rbi rbr rbs rca rcb rcc rcd rci rcr rcs rda rdb rdc rdd rdi rdr rds ria rib ric rid rii rir ris rra rrb rrc rrd rri rrr rrs rsa rsb rsc rsd rsi rsr rss saa sab sac sad sai sar sas sba sbb sbc sbd sbi sbr sbs sca scb scc scd sci scr scs sda sdb sdc sdd sdi sdr sds sia sib sic sid sii sir sis sr- sra srb src srd sri srr srs ss- ssa ssb ssc ssd ssi ssr sss