a-a a-b a-i a-t aaa aab aai aao aas aat aau ab- aba abb abi abo abs abt abu ai- aia aib aii aio ais ait aiu aoa aob aoi aoo aos aot aou as- asa asb asi aso ass ast asu at- ata atb ati ato ats att atu au- aua aub aui auo aus aut b-u baa bab bai bao bas bat bau bba bbb bbi bbo bbs bbt bbu bi- bia bib bii bio bis bit biu boa bob boi boo bos bot bou bsa bsb bsi bso bss bst bsu bta btb bti bto bts btt btu bua bub bui buo bus but buu ia- iaa iab iai iao ias iat iau iba ibb ibi ibo ibs ibt ibu iia iib iii iio iis iit iiu io- ioa iob ioi ioo ios iot iou is- isa isb isi iso iss ist isu ita itb iti ito its itt itu iu- iua iub iui ius iut o-i oaa oab oai oao oas oat oau ob- oba obb obi obo obs obt obu oia oib oii oio ois oit oiu oo- ooa oob ooi ooo oos oot os- osa osb osi oso oss ost osu ot- ota otb oti oto ots ott otu ou- oua oui ouo ous out saa sab sai sao sas sat sau sba sbb sbi sbo sbs sbt sbu sia sib sii sio sis sit siu soa sob soi soo sos sot sou ss- ssa ssb ssi sso sss sst ssu sta stb sti sto sts stt stu sua sub sui suo sus sut suu taa tab tai tao tas tat tau tba tbb tbi tbo tbs tbt tbu tia tib tii tio tis tit tiu to- toa tob toi too tos tot tou tsa tsb tsi tso tss tst tsu tta ttb tti tto tts ttt ttu tua tub tui tuo tus tut tuu ua- uaa uab uai uao uas uat uau uba ubb ubi ubo ubs ubt ubu uia uib uii uio uis uit uiu uoa uob uoo uos uot usa usb usi uso uss ust usu uta utb uti uto uts utt utu uua uus uut uuu