kkk kkp kks kkv kky kok koo kop kos koy kpk kpo kpp kps kpv ksk kso ksp kss ksv kvk kvo kvp kvs kvv kyo kyp kys okk oko okp oks oo- ook ooo oop oos oov op- opk opo opp ops opv opy os- osk oso osp oss osv ov- ovo ovp ovs ovv oyo oys p-p pko pkp pks pky pok poo pop pos pov poy ppk ppo ppp pps ppv ps- psk pso psp pss psv psy pvk pvo pvp pvs pvv py- pyk pyo pys sk- skk sko skp sks sky sok soo sop sos sov soy spk spo spp sps spv spy ss- ssk sso ssp sss ssv svk svo svp svs svv svy sy- syk syp sys vkp vok voo vop vos vov voy vpk vpo vpp vps vsk vso vsp vss vsv vvo vvs vvv vyp ykk yok yoo yop yos yoy ypo yps ysk yso ysp yss ysy yvo yvy yys yyy