-ic a-a a-b a-c a-i aaa aab aac aai aas aau ab- aba abb abc abi abs abu ac- aca acb acc aci acs acu ai- aia aib aic aii ais aiu as- asa asb asc asi ass asu au- aua aub auc aui aus b-u baa bab bac bai bas bau bba bbb bbc bbi bbs bbu bca bcb bcc bci bcs bcu bi- bia bib bic bii bis biu bsa bsb bsc bsi bss bsu bua bub buc bui bus buu c-- caa cab cac cai cas cau cba cbb cbc cbi cbs cbu cca ccb ccc cci ccs ccu ci- cia cib cic cii cis ciu csa csb csc csi css csu cua cub cuc cui cus cuu ia- iaa iab iac iai ias iau iba ibb ibc ibi ibs ibu ica icb icc ici ics icu iia iib iic iii iis iiu is- isa isb isc isi iss isu iu- iua iub iuc iui ius saa sab sac sai sas sau sba sbb sbc sbi sbs sbu sca scb scc sci scs scu sia sib sic sii sis siu ss- ssa ssb ssc ssi sss ssu sua sub suc sui sus suu ua- uaa uab uac uai uas uau uba ubb ubc ubi ubs ubu uca ucb ucc uci ucs ucu uia uib uic uii uis uiu usa usb usc usi uss usu uua uuc uus uuu