code: def _accept(prefix):
      return prefix[:6] in [b"GIF87a", b"GIF89a"]
  
imports: import itertools
  from .None import Image, ImageChops, ImageFile, ImagePalette, ImageSequence
  from ._binary import i8, i16le, o8, o16le
label_desc: Use image node_id 1 for calling a global function with example usage: _accept(prefix) and returns: unknown