omc omd omh oml omm omn omo omr oms on- ona onc ond onh onk onl onn ono onr ons oo- ooa ooc ood ooh ook ool oom oon ooo oor oos or- ora orc ord orh ork orl orm orn oro orr ors os- osa osc osd osh osk osl osm osn oso osr oss ra- raa rac rad rah rak ral ram ran rao rar ras rca rcc rcd rch rcl rcm rcn rco rcr rcs rda rdc rdd rdh rdl rdm rdn rdo rdr rds rh- rha rhc rhd rhh rhl rhm rhn rho rhr rhs rkc rkk rkm rko rks rla rlc rld rlh rll rlm rln rlo rlr rls rma rmc rmd rmh rml rmm rmn rmo rmr rms rna rnc rnd rnh rnm rnn rno rnr rns roa roc rod roh rok rol rom ron roo ror ros rra rrc rrd rrh rrk rrl rrm rrn rrr rrs rsa rsc rsd rsh rsk rsl rsm rsn rso rsr rss saa sac sad sah sak sal sam san sao sar sas sca scc scd sch sck scl scm scn sco scr scs sda sdc sdd sdh sdk sdl sdm sdn sdo sdr sds sh- sha shc shd shh shk shl shm shn sho shr shs sk- ska skc skd skh skk skl skm sko skr sks sla slc sld slh slk sll slm sln slo slr sls sma smc smd smh smk sml smm smn smo smr sms sna snc snd snk snl snm snn sno snr sns soa soc sod soh sok sol som son soo sor sos sr- sra src srd srh srk srl srm srn sro srr srs ss- ssa ssc ssd ssh ssk ssl ssm ssn sso ssr sss