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Nov 19th, 2019
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  1. <number> ::= <optional-sign> <digit-sequence> <optional-fraction> <optional-exponent>
  2. <optional-sign> ::= "" | "+" | "-"
  3. <optional-fraction> ::= "" | "." <digit-sequence>
  4. <optional-exponent> ::= "" | "e" <optional-sign> <digit-sequence>
  5. <digit-sequence> ::= <digit> | <digit> <digit-sequence>
  6. <digit> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
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