a-a a-b a-t aaa aab aam aan aao aas aat ab- aba abb abm abn abo abs abt ama amb amm amn amo ams amt an- ana anb anm ann ano ans ant aoa aob aom aon aoo aos aot as- asa asb asm asn aso ass ast at- ata atb atm atn ato ats att baa bab bam ban bao bas bat bba bbb bbm bbn bbo bbs bbt bma bmb bmm bmn bmo bms bmt bna bnb bnn bno bns bnt boa bob bom bon boo bos bot bsa bsb bsm bsn bso bss bst bta btb btm btn bto bts btt m-o maa mab mam man mao mas mat mba mbb mbm mbo mbs mbt mma mmb mmm mmn mmo mms mmt mna mnb mnm mnn mno mns mnt moa mob mom mon moo mos mot msa msb msm msn mso mss mst mta mtb mtm mtn mto mts mtt naa nab nam nan nao nas nat nba nbb nbm nbn nbo nbs nbt nma nmb nmm nmn nmo nms nmt nna nnb nnm nnn nno nns nnt no- noa nob nom non noo nos not nsa nsb nsm nsn nso nss nst nta ntb ntm ntn nto nts ntt oaa oab oam oan oao oas oat ob- oba obb obm obn obo obs obt om- oma omb omm omn omo oms omt on- ona onb onn ono ons ont oo- ooa oob oom oon ooo oos oot os- osa osb osm osn oso oss ost ot- ota otb otm otn oto ots ott saa sab sam san sao sas sat sba sbb sbm sbn sbo sbs sbt sma smb smm smn smo sms smt sna snb snm snn sno sns snt soa sob som son soo sos sot ss- ssa ssb ssm ssn sso sss sst sta stb stm stn sto sts stt taa tab tam tan tao tas tat tba tbb tbm tbn tbo tbs tbt tma tmb tmm tmn tmo tms tmt tna tnb tnm tnn tno tns tnt to- toa tob tom ton too tos tot tsa tsb tsm tsn tso tss tst tta ttb ttm ttn tto tts ttt