a-a a-b a-t aaa aab aan aao aas aat aau ab- aba abb abn abo abs abt abu an- ana anb ann ano ans ant anu aoa aob aon aoo aos aot aou as- asa asb asn aso ass ast asu at- ata atb atn ato ats att atu au- aua aub aun auo aus aut b-u baa bab ban bao bas bat bau bba bbb bbn bbo bbs bbt bbu bna bnb bnn bno bns bnt bnu boa bob bon boo bos bot bou bsa bsb bsn bso bss bst bsu bta btb btn bto bts btt btu bua bub bun buo bus but buu naa nab nan nao nas nat nau nba nbb nbn nbo nbs nbt nbu nna nnb nnn nno nns nnt nnu no- noa nob non noo nos not nou nsa nsb nsn nso nss nst nsu nta ntb ntn nto nts ntt ntu nua nub nun nuo nus nut nuu oaa oab oan oao oas oat oau ob- oba obb obn obo obs obt obu on- ona onb onn ono ons ont onu oo- ooa oob oon ooo oos oot os- osa osb osn oso oss ost osu ot- ota otb otn oto ots ott otu ou- oua oun ouo ous out saa sab san sao sas sat sau sba sbb sbn sbo sbs sbt sbu sna snb snn sno sns snt snu soa sob son soo sos sot sou ss- ssa ssb ssn sso sss sst ssu sta stb stn sto sts stt stu sua sub sun suo sus sut suu taa tab tan tao tas tat tau tba tbb tbn tbo tbs tbt tbu tna tnb tnn tno tns tnt to- toa tob ton too tos tot tou tsa tsb tsn tso tss tst tsu tta ttb ttn tto tts ttt ttu tua tub tun tuo tus tut tuu ua- uaa uab uan uao uas uat uau uba ubb ubn ubo ubs ubt ubu un- una unb unn uno uns unt unu uoa uob uon uoo uos uot usa usb usn uso uss ust usu uta utb utn uto uts utt utu uua uun uus uut uuu