m-o m-r mmm mmo mmr mms mmt mom moo mor mos mot mrm mro mrr mrs mrt msm mso msr mss mst mtm mto mtr mts mtt om- omm omo omr oms omt oo- oom ooo oor oos oot or- orm oro orr ors ort os- osm oso osr oss ost ot- otm oto otr ots ott rmm rmo rmr rms rmt rom roo ror ros rot rrm rrr rrs rrt rsm rso rsr rss rst rtm rto rtr rts rtt smm smo smr sms smt som soo sor sos sot sr- srm sro srr srs srt ss- ssm sso ssr sss sst stm sto str sts stt tmm tmo tmr tms tmt to- tom too tor tos tot trm tro trr trs trt tsm tso tsr tss tst ttm tto ttr tts ttt