Assuming you want to add a dative case suffix (-e, -a) to a noun, which of the following data would you need to know?

1. What the last vowel is
   
2. How many vowels there are in the word
3. Whether the word ends with a vowel or a consonant
   
4. What the first vowel is
5. What the last consonant is
6. What the first consonant is