-er eee eek eep eer eev eie eii eik eip eir eiv eke eki ekp ekr ekv ep- epe epi epp epr ere eri erk erp err erv eve evi evp evr evv i-v ie- iee iei iek iep ier iev iie iii iip iir ike iki ikk ikr ikv ipe ipi ipp ipr ipv ir- ire iri irk irp irr irv ive ivi ivp ivr ivv ke- kee kei kek kep ker kev kie kii kik kip kir kiv kke kki kkk kkp kkr kkv kpe kpi kpk kpp kpr kpv kri krk krp krr krv kvi kvk kvp kvr kvv p-p pee pei pek pep per pev pie pii pik pip pir piv pke pki pkp pkr ppe ppi ppk ppp ppr ppv pre pri prk prp prr prv pve pvi pvk pvp pvr pvv re- ree rei rek rep rer rev rie rii rik rip rir riv rke rkk rkp rkv rpe rpi rpk rpp rpr rpv rri rrk rrp rrr rve rvi rvp rvr rvv v-e vee vei vek vep ver vi- vie vii vik vip vir viv vkp vpe vpi vpk vpp vpr vre vri vrk vrp vrr vvi vvr vvv