nki nkk nkn nko nks nla nlb nlc nlf nlg nli nlk nll nln nlo nls nna nnb nnc nnf nng nni nnk nnl nnn nno nns no- noa nob noc nof nog noi nok nol non noo nos nsa nsb nsc nsf nsg nsi nsk nsl nsn nso nss o-i oaa oab oac oaf oag oai oak oal oan oao oas ob- oba obb obc obf obg obi obk obl obn obo obs oc- oca ocb occ ocf ocg oci ock ocl ocn oco ocs of- ofa ofb ofc off ofg ofi ofl ofn ofo ofs oga ogc ogf ogg ogi ogl ogn ogo ogs oia oib oic oif oii oik oil oin oio ois oka okb okc okg oki okk okl oko oks ola olb olc olf olg oli olk oll oln olo ols on- ona onb onc onf ong oni onk onl onn ono ons oo- ooa oob ooc oof oog ooi ook ool oon ooo oos os- osa osb osc osf osg osi osk osl osn oso oss saa sab sac saf sag sai sak sal san sao sas sba sbb sbc sbf sbg sbi sbk sbl sbn sbo sbs sca scb scc scf scg sci sck scl scn sco scs sfa sfb sfc sff sfg sfi sfk sfl sfn sfo sfs sga sgb sgc sgf sgg sgi sgk sgl sgn sgo sgs sia sib sic sif sig sii sik sil sin sio sis sk- ska skb skc skf skg ski skk skl sko sks sla slb slc slf slg sli slk sll sln slo sls sna snb snc snf sng sni snk snl snn sno sns soa sob soc sof sog soi sok sol son soo sos ss- ssa ssb ssc ssf ssg ssi ssk ssl ssn sso sss