-ic a-a a-b a-c a-i aaa aab aac aad aai aak aar aas ab- aba abb abc abd abi abk abr abs ac- aca acb acc acd aci ack acr acs ad- ada adb adc add adi adk adr ads ai- aia aib aic aid aii aik air ais aka akb akc akd aki akk akr aks ar- ara arb arc ard ari ark arr ars as- asa asb asc asd asi ask asr ass baa bab bac bad bai bak bar bas bba bbb bbc bbd bbi bbk bbr bbs bca bcb bcc bcd bci bck bcr bcs bda bdb bdc bdd bdi bdk bdr bds bi- bia bib bic bid bii bik bir bis bka bkb bkc bkk bkr bks bra brb brd bri brk brr brs bsa bsb bsc bsd bsi bsk bsr bss c-- caa cab cac cad cai cak car cas cba cbb cbc cbd cbi cbk cbr cbs cca ccb ccc ccd cci cck ccr ccs cda cdb cdc cdd cdi cdk cdr cds ci- cia cib cic cid cii cik cir cis cka ckb ckc ckd cki cks cra crb crc crd cri crk crr crs csa csb csc csd csi csk csr css daa dab dac dad dai dak dar das dba dbb dbc dbd dbi dbk dbr dbs dca dcb dcc dcd dci dck dcr dcs dda ddb ddc ddd ddi ddk ddr dds di- dia dib dic did dii dik dir dis dka dkb dkc dki dkk dkr dks dra drb drc drd dri drk drr drs dsa dsb dsc dsd dsi dsk dsr dss i-d ia- iaa iab iac iad iai iar ias iba ibb ibc ibd ibi ibk ibr ibs ica icb icc icd ici ick icr ics ida idb idc idd idi idk idr ids iia iib iic iid iii iir iis ika ikb ikc iki ikk ikr iks ir- ira irb irc ird iri irk irr irs is- isa isb isc isd isi isk isr iss ka- kaa kab kac kad kai kak kar kas kba kbb kbc kbd kbi kbk kbr kbs kca kcb kcc kcd kci kck kcr kcs kda kdb kdc kdk kdr kds kia kib kic kid kii kik kir kis kkb kkc kki kkk kkr kks kra krc krd kri krk krr krs ksa ksb ksc ksd ksi ksk ksr kss ra- raa rab rac rad rai rak rar ras rba rbb rbc rbd rbi rbk rbr rbs rca rcb rcc rcd rci rcr rcs rda rdb rdc rdd rdi rdr rds ria rib ric rid rii rik rir ris rkb rkc rkk rks rra rrb rrc rrd rri rrk rrr rrs rsa rsb rsc rsd rsi rsk rsr rss saa sab sac sad sai sak sar sas sba sbb sbc sbd sbi sbk sbr sbs sca scb scc scd sci sck scr scs sda sdb sdc sdd sdi sdk sdr sds sia sib sic sid sii sik sir sis sk- ska skb skc skd ski skk skr sks sr- sra srb src srd sri srk srr srs ss- ssa ssb ssc ssd ssi ssk ssr sss