code: def _find_comment_end(self, block, start=0):
      a = block.find(b"\n", start)
      b = block.find(b"\r", start)
      return min(a, b) if a * b > 0 else max(a, b)
  
imports: from .None import Image, ImageFile
  from ._binary import i16be
  from ._binary import o8
  from ._binary import o32le
label_desc: Use image node_id 2 for calling the PpmPlainDecoder obj's underlying member method code with example usage: obj._find_comment_end(block, start) and returns: unknown