Definition: In this task you are given a list of triplets of the form [subject, predicate, object] and the output should be a question based on the triplets but with the subject and/or object replaced with blanks (represented using two or more consecutive underscores). Triplet values encompassed in [*] are special tokens that can be replaced with synonyms. The objective is to construct a question in a manner that (a) captures the facts specified in at least one of the triplets, and (b) ideally contains a limited number of blanks such that it is a well-formed question that is easy to answer. A blank can represent a single word or a phrase.
Input: [['2007', 'VIEWERS', '6.574 million'], ['[TABLECONTEXT]', 'YEAR', '2007'], ['[TABLECONTEXT]', '[TITLE]', 'Brickyard 400'], ['2007', 'NETWORK', 'ESPN']]

In _____, Brickyard 400 was seen by 6.574 million viewers on ESPN.