Looking at the pattern "__i__i_a_", I notice there are two 'i's and an 'a' at the end. The letter 't' is one of the most common consonants in English and could appear in several positions. It's particularly common at the beginning of words and might create recognizable patterns with the revealed 'i's. Since I've already tried common vowels 'a', 'e', and 'i', and common consonants 'n' and 'r', 't' is my next logical choice.