-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aas aat aau ab- aba abb abc abi abo abs abt abu ac- aca acb acc aci aco acs act acu ai- aia aib aic aii aio ais ait aiu aoa aob aoc aoi aoo aos aot aou as- asa asb asc asi aso ass ast asu at- ata atb atc ati ato ats att atu au- aua aub auc aui auo aus aut b-u baa bab bac bai bao bas bat bau bba bbb bbc bbi bbo bbs bbt bbu bca bcb bcc bci bco bcs bct bcu bi- bia bib bic bii bio bis bit biu boa bob boc boi boo bos bot bou bsa bsb bsc bsi bso bss bst bsu bta btb btc bti bto bts btt btu bua bub buc bui buo bus but buu c-- caa cab cac cai cao cas cat cau cba cbb cbc cbi cbo cbs cbt cbu cca ccb ccc cci cco ccs cct ccu ci- cia cib cic cii cio cis cit ciu co- coa cob coc coi coo cos cot cou csa csb csc csi cso css cst csu cta ctb ctc cti cto cts ctt ctu cua cub cuc cui cuo cus cut cuu ia- iaa iab iac iai iao ias iat iau iba ibb ibc ibi ibo ibs ibt ibu ica icb icc ici ico ics ict icu iia iib iic iii iio iis iit iiu io- ioa iob ioc ioi ioo ios iot iou is- isa isb isc isi iso iss ist isu ita itb itc iti ito its itt itu iu- iua iub iuc iui ius iut o-i oaa oab oac oai oao oas oat oau ob- oba obb obc obi obo obs obt obu oc- oca ocb occ oci oco ocs oct ocu oia oib oic oii oio ois oit oiu oo- ooa oob ooc ooi ooo oos oot os- osa osb osc osi oso oss ost osu ot- ota otb otc oti oto ots ott otu ou- oua ouc oui ouo ous out saa sab sac sai sao sas sat sau sba sbb sbc sbi sbo sbs sbt sbu sca scb scc sci sco scs sct scu sia sib sic sii sio sis sit siu soa sob soc soi soo sos sot sou ss- ssa ssb ssc ssi sso sss sst ssu sta stb stc sti sto sts stt stu sua sub suc sui suo sus sut suu taa tab tac tai tao tas tat tau tba tbb tbc tbi tbo tbs tbt tbu tca tcb tcc tci tco tcs tct tcu tia tib tic tii tio tis tit tiu to- toa tob toc toi too tos tot tou tsa tsb tsc tsi tso tss tst tsu tta ttb ttc tti tto tts ttt ttu tua tub tuc tui tuo tus tut tuu ua- uaa uab uac uai uao uas uat uau uba ubb ubc ubi ubo ubs ubt ubu uca ucb ucc uci uco ucs uct ucu uia uib uic uii uio uis uit uiu uoa uob uoc uoo uos uot usa usb usc usi uso uss ust usu uta utb utc uti uto uts utt utu uua uuc uus uut uuu