oai oal oam oao oar oas ob- oba obb obc obd obh obi obl obm obo obr obs oc- oca ocb occ ocd och oci ocl ocm oco ocr ocs oda odb odc odd odh odi odl odm odo odr ods oha ohc ohd ohh ohi ohl ohm oho ohr ohs oia oib oic oid oii oil oim oio oir ois ola olb olc old oli oll olm olo ols om- oma omb omc omd omh omi oml omm omo omr oms oo- ooa oob ooc ood ooh ooi ool oom ooo oor oos or- ora orb orc ord orh ori orl orm oro orr ors os- osa osb osc osd osh osi osl osm oso osr oss ra- raa rab rac rad rah rai ral ram rao rar ras rba rbb rbc rbd rbh rbi rbl rbm rbo rbr rbs rca rcb rcc rcd rch rci rcl rcm rco rcr rcs rda rdb rdc rdd rdh rdi rdl rdm rdo rdr rds rh- rha rhb rhc rhd rhh rhi rhl rhm rho rhr rhs ria rib ric rid rih rii ril rim rio rir ris rla rlc rld rlh rli rll rlm rlo rlr rls rma rmb rmc rmd rmh rmi rml rmm rmo rmr rms roa rob roc rod roh roi rol rom roo ror ros rra rrb rrc rrd rrh rri rrl rrm rrr rrs rsa rsb rsc rsd rsh rsi rsl rsm rso rsr rss saa sab sac sad sah sai sal sam sao sar sas sba sbb sbc sbd sbh sbi sbl sbm sbo sbr sbs sca scb scc scd sch sci scl scm sco scr scs sda sdb sdc sdd sdh sdi sdl sdm sdo sdr sds sh- sha shb shc shd shh shi shl shm sho shr shs sia sib sic sid sih sii sil sim sio sir sis sla slb slc sld slh sli sll slm slo slr sls sma smb smc smd smh smi sml smm smo smr sms soa sob soc sod soh soi sol som soo sor sos sr- sra srb src srd srh sri srl srm sro srr srs ss- ssa ssb ssc ssd ssh ssi ssl ssm sso ssr sss