-ic a-a a-b a-c a-i aaa aab aac aai aak aar aas ab- aba abb abc abi abk abr abs ac- aca acb acc aci ack acr acs ai- aia aib aic aii aik air ais aka akb akc aki akk akr aks ar- ara arb arc ari ark arr ars as- asa asb asc asi ask asr ass baa bab bac bai bak bar bas bba bbb bbc bbi bbk bbr bbs bca bcb bcc bci bck bcr bcs bi- bia bib bic bii bik bir bis bka bkb bkc bkk bkr bks bra brb bri brk brr brs bsa bsb bsc bsi bsk bsr bss c-- caa cab cac cai cak car cas cba cbb cbc cbi cbk cbr cbs cca ccb ccc cci cck ccr ccs ci- cia cib cic cii cik cir cis cka ckb ckc cki cks cra crb crc cri crk crr crs csa csb csc csi csk csr css ia- iaa iab iac iai iar ias iba ibb ibc ibi ibk ibr ibs ica icb icc ici ick icr ics iia iib iic iii iir iis ika ikb ikc iki ikk ikr iks ir- ira irb irc iri irk irr irs is- isa isb isc isi isk isr iss ka- kaa kab kac kai kak kar kas kba kbb kbc kbi kbk kbr kbs kca kcb kcc kci kck kcr kcs kia kib kic kii kik kir kis kkb kkc kki kkk kkr kks kra krc kri krk krr krs ksa ksb ksc ksi ksk ksr kss ra- raa rab rac rai rak rar ras rba rbb rbc rbi rbk rbr rbs rca rcb rcc rci rcr rcs ria rib ric rii rik rir ris rkb rkc rkk rks rra rrb rrc rri rrk rrr rrs rsa rsb rsc rsi rsk rsr rss saa sab sac sai sak sar sas sba sbb sbc sbi sbk sbr sbs sca scb scc sci sck scr scs sia sib sic sii sik sir sis sk- ska skb skc ski skk skr sks sr- sra srb src sri srk srr srs ss- ssa ssb ssc ssi ssk ssr sss