'Yields the head of the chunk (usually, the last word in the chunk).'

@property
def head(self):

    if ((self.type == 'NP') and any((w.type.startswith('NNP') for w in self))):
        w = find((lambda w: w.type.startswith('NNP')), reversed(self))
    elif (self.type == 'NP'):
        w = find((lambda w: w.type.startswith('NN')), reversed(self))
    elif (self.type == 'VP'):
        w = find((lambda w: w.type.startswith('VB')), reversed(self))
    elif (self.type == 'PP'):
        w = find((lambda w: w.type.startswith(('IN', 'PP'))), self)
    elif (self.type == 'PNP'):
        w = find((lambda w: w.type.startswith('NN')), reversed(self))
    else:
        w = None
    if (w is None):
        w = self[(-1)]
    return w
