| | Symbol | Meaning |
| | The length of the tag’s ID | | ℇ | The parameter of command BQ, which means empty and occupies 1 bit | | || | Connection operator. For example, | | & | Bitwise AND operator. For example, | | << | Left shift operator. For example, | | Calculate the length of the string . For example, | | ID [, ] | Get the -th string of ID, where . For example, if ，then | | Count () | Count the number of 1 in the binary number . For example, |
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