<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def hyphenate_word(self, word):
 """ Given a word, returns a list of pieces, broken at the possible hyphenation points. """

        # Short words aren't hyphenated.
        if len(word) <= 4:
            return [word]
        # If the word is an exception, get the stored points.
        if word.lower() in self.exceptions:
            points = self.exceptions[word.lower()]
        else:
            work = '.' + word.lower() + '.'
            points = [0] * (len(work)+1)
            for i in range(len(work)):
                t = self.tree
                for c in work[i:]:
                    if c in t:
                        t = t[c]
                        if None in t:
                            p = t[None]
                            for j in range(len(p)):
                                points[i+j] = max(points[i+j], p[j])
                    else:
                        break
            # No hyphens in the first two chars or the last two.
            points[1] = points[2] = points[-2] = points[-3] = 0

        # Examine the points to build the pieces list.
        pieces = ['']
        for c, p in zip(word, points[2:]):
            pieces[-1] += c
            if p % 2:
                pieces.append('')
        return pieces