class_docstr: Produces a sequence that's the concatenation of multiple other sequences, without
  copying the elements.
  
  This assumes that the inner sequence never changes. If it does, the results
  are undefined.
class_docstr_tok: ["Produces","a","sequence","that","'s","the","concatenation","of","multiple","other","sequences",",","without","copying","the","elements",".","This","assumes","that","the","inner","sequence","never","changes",".","If","it","does",",","the","results","are","undefined","."]
code: def __contains__(self, item) -> bool:
      return any(s.__contains__(item) for s in self.sequences)
  
file_path: allennlp/allennlp/common/sequences.py
imports: import bisect
  import random
  from collections import abc
  from typing import Sequence, Optional, Union
label_desc: Use image node_id 4 for calling the ConcatenatedSequence obj's underlying member method code with example usage: obj.__contains__(item) and returns: any