Consider the following reasoning: row can play "h" if it is reasonable for her to believe that column will play "H". Column can play "H" if its reasonable for him to believe that row will play "t". Row can play "t" if it is reasonable for her to believe that column will play "T". Column can play "T" if it is reasonable for him to believe that row will play "h" (beginning the cycle again). This provides an infinite set of consistent beliefs that results in row playing "h". A similar argument can be given for row playing "t", and for column playing either "H" or "T".