navi1-3  Exercise 2: Case Forms
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tute "person" (ends in a vowel, e)
  subjective   tute
  agentive     tutel
  patientive   tutet  or  tuteti
  dative       tuter  or  tuteru
  genitive     tuteyä
  topical      tuteri

eylan "friend" (ends in a consonant, n)
  subjective   eylan
  agentive     eylanìl
  patientive   eylanit  or  eylanti
  dative       eylanur
  genitive     eylanä
  topical      eylanìri

Why the endings differ
  A vowel-final noun adds the shorter ending (-l, -t/-ti, -r/-ru, -yä, -ri);
  a consonant-final noun uses a form with a linking vowel (-ìl, -it, -ur, -ä, -ìri)
  so the consonants do not pile up.

Why eylanti is possible
  The ending -ti can follow any final sound, vowel or consonant. -it is the
  extra option after a consonant, so a consonant-final noun has two choices.

(The dative after a consonant is given as -ur in the reference grammar;
check the community dictionary if you see another form.)