kkk kkp kks kkv kok koo kop kos kpk kpo kpp kps kpv ksk kso ksp kss ksv kvk kvo kvp kvs kvv okk oko okp oks oo- ook ooo oop oos oov op- opk opo opp ops opv os- osk oso osp oss osv ov- ovo ovp ovs ovv p-p pko pkp pks pok poo pop pos pov ppk ppo ppp pps ppv ps- psk pso psp pss psv pvk pvo pvp pvs pvv sk- skk sko skp sks sok soo sop sos sov spk spo spp sps spv ss- ssk sso ssp sss ssv svk svo svp svs svv vkp vok voo vop vos vov vpk vpo vpp vps vsk vso vsp vss vsv vvo vvs vvv