nsl nsn nso nsp nss o-i oaa oab oac oad oae oai oal oan oao oap oas ob- oba obb obc obd obe obi obl obn obo obp obs oc- oca ocb occ ocd oci ocl ocn oco ocp ocs oda odb odc odd ode odi odl odn odo odp ods oea oeb oec oed oee oei oel oen oeo oep oes oia oib oic oid oie oii oil oin oio oip ois ola olb olc old ole oli oll oln olo olp ols on- ona onb onc ond one oni onl onn ono onp ons oo- ooa oob ooc ood ooi ool oon ooo oop oos op- opa opb opc opd ope opi opl opn opo opp ops os- osa osb osc osd ose osi osl osn oso osp oss p-p paa pab pac pad pae pai pal pan pao pap pas pba pbb pbc pbd pbe pbi pbl pbn pbo pbp pbs pca pcb pcc pcd pce pci pcl pcn pco pcp pcs pda pdb pdc pdd pde pdi pdl pdn pdo pdp pds pea peb pec ped pee pei pel pen peo pep pes pia pib pic pid pie pii pil pin pio pip pis pla plb plc pld ple pli pll pln plo plp pls pn- pna pnb pnc pnd pne pni pnl pnn pno pnp pns poa pob poc pod poe poi pol pon poo pop pos ppa ppb ppc ppd ppe ppi ppl ppn ppo ppp pps ps- psa psb psc psd pse psi psl psn pso psp pss saa sab sac sad sae sai sal san sao sap sas sba sbb sbc sbd sbe sbi sbl sbn sbo sbp sbs sca scb scc scd sce sci scl scn sco scp scs sda sdb sdc sdd sde sdi sdl sdn sdo sdp sds se- sea seb sec sed see sei sel sen seo sep ses sia sib sic sid sie sii sil sin sio sip sis sla slb slc sld sle sli sll sln slo slp sls sna snb snc snd sne sni snl snn sno snp sns soa sob soc sod soe soi sol son soo sop sos spa spb spc spd spe spi spl spn spo spp sps ss- ssa ssb ssc ssd sse ssi ssl ssn sso ssp sss