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  "<bos>": 0,
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  "P": 26,
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  "[C@@H]": 28,
  "[C@@]": 29,
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  "[C@]": 31,
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  "[CH2-]": 33,
  "[N+]": 34,
  "[N-]": 35,
  "[NH+]": 36,
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  "[NH2+]": 38,
  "[NH3+]": 39,
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  "[O-]": 41,
  "[OH+]": 42,
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  "[SH+]": 55,
  "[n+]": 56,
  "[n-]": 57,
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}