nsm nsn nso nsp nss o-i oaa oab oac oae oai oal oam oan oao oap oas ob- oba obb obc obe obi obl obm obn obo obp obs oc- oca ocb occ oci ocl ocm ocn oco ocp ocs oea oeb oec oee oei oel oem oen oeo oep oes oia oib oic oie oii oil oim oin oio oip ois ola olb olc ole oli oll olm oln olo olp ols om- oma omb omc ome omi oml omm omn omo omp oms on- ona onb onc one oni onl onn ono onp ons oo- ooa oob ooc ooi ool oom oon ooo oop oos op- opa opb opc ope opi opl opm opn opo opp ops os- osa osb osc ose osi osl osm osn oso osp oss p-p paa pab pac pae pai pal pam pan pao pap pas pba pbb pbc pbe pbi pbl pbm pbn pbo pbp pbs pca pcb pcc pce pci pcl pcm pcn pco pcp pcs pea peb pec pee pei pel pem pen peo pep pes pia pib pic pie pii pil pim pin pio pip pis pla plb plc ple pli pll plm pln plo plp pls pma pmb pmc pme pmi pml pmm pmn pmo pmp pms pn- pna pnb pnc pne pni pnl pnm pnn pno pnp pns poa pob poc poe poi pol pom pon poo pop pos ppa ppb ppc ppe ppi ppl ppm ppn ppo ppp pps ps- psa psb psc pse psi psl psm psn pso psp pss saa sab sac sae sai sal sam san sao sap sas sba sbb sbc sbe sbi sbl sbm sbn sbo sbp sbs sca scb scc sce sci scl scm scn sco scp scs se- sea seb sec see sei sel sem sen seo sep ses sia sib sic sie sii sil sim sin sio sip sis sla slb slc sle sli sll slm sln slo slp sls sma smb smc sme smi sml smm smn smo smp sms sna snb snc sne sni snl snm snn sno snp sns soa sob soc soe soi sol som son soo sop sos spa spb spc spe spi spl spm spn spo spp sps ss- ssa ssb ssc sse ssi ssl ssm ssn sso ssp sss