kkk kkp kks kky kok koo kop kos koy kpk kpo kpp kps ksk kso ksp kss kyo kyp kys okk oko okp oks oo- ook ooo oop oos op- opk opo opp ops opy os- osk oso osp oss oyo oys p-p pko pkp pks pky pok poo pop pos poy ppk ppo ppp pps ps- psk pso psp pss psy py- pyk pyo pys sk- skk sko skp sks sky sok soo sop sos soy spk spo spp sps spy ss- ssk sso ssp sss sy- syk syp sys ykk yok yoo yop yos yoy ypo yps ysk yso ysp yss ysy yys yyy