a-a a-b a-i aaa aab aai aan aao aas aau ab- aba abb abi abn abo abs abu ai- aia aib aii ain aio ais aiu an- ana anb ani ann ano ans anu aoa aob aoi aon aoo aos aou as- asa asb asi asn aso ass asu au- aua aub aui aun auo aus b-u baa bab bai ban bao bas bau bba bbb bbi bbn bbo bbs bbu bi- bia bib bii bin bio bis biu bna bnb bni bnn bno bns bnu boa bob boi bon boo bos bou bsa bsb bsi bsn bso bss bsu bua bub bui bun buo bus buu ia- iaa iab iai ian iao ias iau iba ibb ibi ibn ibo ibs ibu iia iib iii iin iio iis iiu in- ina inb ini inn ino ins inu io- ioa iob ioi ion ioo ios iou is- isa isb isi isn iso iss isu iu- iua iub iui ius n-i naa nab nai nan nao nas nau nba nbb nbi nbn nbo nbs nbu nia nib nii nin nio nis niu nna nnb nni nnn nno nns nnu no- noa nob noi non noo nos nou nsa nsb nsi nsn nso nss nsu nua nub nui nun nuo nus nuu o-i oaa oab oai oan oao oas oau ob- oba obb obi obn obo obs obu oia oib oii oin oio ois oiu on- ona onb oni onn ono ons onu oo- ooa oob ooi oon ooo oos os- osa osb osi osn oso oss osu ou- oua oui oun ouo ous saa sab sai san sao sas sau sba sbb sbi sbn sbo sbs sbu sia sib sii sin sio sis siu sna snb sni snn sno sns snu soa sob soi son soo sos sou ss- ssa ssb ssi ssn sso sss ssu sua sub sui sun suo sus suu ua- uaa uab uai uan uao uas uau uba ubb ubi ubn ubo ubs ubu uia uib uii uin uio uis uiu un- una unb uni unn uno uns unu uoa uob uon uoo uos usa usb usi usn uso uss usu uua uun uus uuu