Looking at the 6-letter word with 'a' in the 3rd position, I should choose a common consonant. 'T' is one of the most frequent letters in English and appears in many common words. Since I've already tried one vowel ('e') which was incorrect, going with a high-frequency consonant is a logical next step. 'T' could appear at the beginning (like in "travel"), end (like in "bright"), or other positions.