Something wrong #4

File ~/Desktop/wav2vec2/test IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:205, in FeatureTable()
    [191](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:191)     """Answer question "are `ft_mask`'s features a subset of ft_seg?"
    [192](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:192) 
    [193](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:193)     Args:
   (...)
    [198](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:198)         bool: True iff all features in `ft_mask` are also in `ft_seg`
    [199](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:199)     """
    [200](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:200)     return set(ft_mask) <= set(ft_seg)
    [202](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:202) def fts_match(
    [203](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:203)         self,
    [204](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:204)         features: Iterable[tuple[str, str]],
--> [205](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:205)         segment: str | None):
    [206](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:206)     """Answer question "are `ft_mask`'s features a subset of ft_seg?"
    [207](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:207) 
    [208](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:208)     This is like `FeatureTable.match` except that it checks whether a
   (...)
    [217](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:217)               if segment is not valid
    [218](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:218)     """
    [219](https://file+.vscode-resource.vscode-cdn.net/Users/vovanthuong/Desktop/wav2vec2/test%20IPA/~/Desktop/wav2vec2/test%20IPA/.venv/lib/python3.9/site-packages/panphon/_panphon.py:219)     feature_set: set[tuple[str, str]] = set(features)

TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'