a-a a-t aaa aam aao aas aat ama amm amo ams amt aoa aom aoo aos aot as- asa asm aso ass ast at- ata atm ato ats att m-o maa mam mao mas mat mma mmm mmo mms mmt moa mom moo mos mot msa msm mso mss mst mta mtm mto mts mtt oaa oam oao oas oat om- oma omm omo oms omt oo- ooa oom ooo oos oot os- osa osm oso oss ost ot- ota otm oto ots ott saa sam sao sas sat sma smm smo sms smt soa som soo sos sot ss- ssa ssm sso sss sst sta stm sto sts stt taa tam tao tas tat tma tmm tmo tms tmt to- toa tom too tos tot tsa tsm tso tss tst tta ttm tto tts ttt