code: def vec(self):
      localctx = AutolevParser.VecContext(self, self._ctx, self.state)
      self.enterRule(localctx, 52, self.RULE_vec)
      try:
          self.state = 364
          self._errHandler.sync(self)
          token = self._input.LA(1)
          if token in [48]:
              self.enterOuterAlt(localctx, 1)
              self.state = 356
              self.match(AutolevParser.ID)
              self.state = 358
              self._errHandler.sync(self)
              _alt = 1
              while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
                  if _alt == 1:
                      self.state = 357
                      self.match(AutolevParser.T__20)
  
                  else:
                      raise NoViableAltException(self)
                  self.state = 360
                  self._errHandler.sync(self)
                  _alt = self._interp.adaptivePredict(
                      self._input, 41, self._ctx
                  )
  
              pass
          elif token in [22]:
              self.enterOuterAlt(localctx, 2)
              self.state = 362
              self.match(AutolevParser.T__21)
              pass
          elif token in [23]:
              self.enterOuterAlt(localctx, 3)
              self.state = 363
              self.match(AutolevParser.T__22)
              pass
          else:
              raise NoViableAltException(self)
  
      except RecognitionException as re:
          localctx.exception = re
          self._errHandler.reportError(self, re)
          self._errHandler.recover(self, re)
      finally:
          self.exitRule()
      return localctx
  
imports: from antlr4 import *
  from io import StringIO
  import sys
label_desc: Use image node_id 28 for calling the AutolevParser obj's underlying member method code with example usage: obj.vec() and returns: localctx