oam oan oao oap oas ob- oba obb obc obd obe obl obm obn obo obp obs oc- oca ocb occ ocd ocl ocm ocn oco ocp ocs oda odb odc odd ode odl odm odn odo odp ods oea oeb oec oed oee oel oem oen oeo oep oes ola olb olc old ole oll olm oln olo olp ols om- oma omb omc omd ome oml omm omn omo omp oms on- ona onb onc ond one onl onn ono onp ons oo- ooa oob ooc ood ool oom oon ooo oop oos op- opa opb opc opd ope opl opm opn opo opp ops os- osa osb osc osd ose osl osm osn oso osp oss p-p paa pab pac pad pae pal pam pan pao pap pas pba pbb pbc pbd pbe pbl pbm pbn pbo pbp pbs pca pcb pcc pcd pce pcl pcm pcn pco pcp pcs pda pdb pdc pdd pde pdl pdm pdn pdo pdp pds pea peb pec ped pee pel pem pen peo pep pes pla plb plc pld ple pll plm pln plo plp pls pma pmb pmc pmd pme pml pmm pmn pmo pmp pms pn- pna pnb pnc pnd pne pnl pnm pnn pno pnp pns poa pob poc pod poe pol pom pon poo pop pos ppa ppb ppc ppd ppe ppl ppm ppn ppo ppp pps ps- psa psb psc psd pse psl psm psn pso psp pss saa sab sac sad sae sal sam san sao sap sas sba sbb sbc sbd sbe sbl sbm sbn sbo sbp sbs sca scb scc scd sce scl scm scn sco scp scs sda sdb sdc sdd sde sdl sdm sdn sdo sdp sds se- sea seb sec sed see sel sem sen seo sep ses sla slb slc sld sle sll slm sln slo slp sls sma smb smc smd sme sml smm smn smo smp sms sna snb snc snd sne snl snm snn sno snp sns soa sob soc sod soe sol som son soo sop sos spa spb spc spd spe spl spm spn spo spp sps ss- ssa ssb ssc ssd sse ssl ssm ssn sso ssp sss