msm mso msr mss o-i oaa oab oac oad oae oai oal oam oao oar oas ob- oba obb obc obd obe obi obl obm obo obr obs oc- oca ocb occ ocd oci ocl ocm oco ocr ocs oda odb odc odd ode odi odl odm odo odr ods oea oeb oec oed oee oei oel oem oeo oer oes oia oib oic oid oie oii oil oim oio oir ois ola olb olc old ole oli oll olm olo ols om- oma omb omc omd ome omi oml omm omo omr oms oo- ooa oob ooc ood ooi ool oom ooo oor oos or- ora orb orc ord ore ori orl orm oro orr ors os- osa osb osc osd ose osi osl osm oso osr oss ra- raa rab rac rad rae rai ral ram rao rar ras rba rbb rbc rbd rbe rbi rbl rbm rbo rbr rbs rca rcb rcc rcd rce rci rcl rcm rco rcr rcs rda rdb rdc rdd rde rdi rdl rdm rdo rdr rds re- rea reb rec red ree rei rel rem reo rer res ria rib ric rid rie rii ril rim rio rir ris rla rlc rld rle rli rll rlm rlo rlr rls rma rmb rmc rmd rme rmi rml rmm rmo rmr rms roa rob roc rod roe roi rol rom roo ror ros rra rrb rrc rrd rri rrl rrm rrr rrs rsa rsb rsc rsd rse rsi rsl rsm rso rsr rss saa sab sac sad sae sai sal sam sao sar sas sba sbb sbc sbd sbe sbi sbl sbm sbo sbr sbs sca scb scc scd sce sci scl scm sco scr scs sda sdb sdc sdd sde sdi sdl sdm sdo sdr sds se- sea seb sec sed see sei sel sem seo ser ses sia sib sic sid sie sii sil sim sio sir sis sla slb slc sld sle sli sll slm slo slr sls sma smb smc smd sme smi sml smm smo smr sms soa sob soc sod soe soi sol som soo sor sos sr- sra srb src srd sre sri srl srm sro srr srs ss- ssa ssb ssc ssd sse ssi ssl ssm sso ssr sss