code: def front(self, *fields):
          '''Return the front pair of the structure'''
          ts = self.irange(0, 0, fields=fields)
          if ts:
              return ts.start(), ts[0f front(self, *fields):
          '''Return the front pair of the structure'''
          ts = self.irange(0, 0, fields=fields)
          if ts:
              return ts.start(), ts[0]
docs: Return the front pair of the structure