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| x00 | ::= | 0000 0000 | 1000 0000 x00 |
| x01 | ::= | 0000 0001 | 1000 0001 x00 |
| x02 | ::= | 0000 0010 | 1000 0010 x00 |
| x03 | ::= | 0000 0011 | 1000 0011 x00 |
| x04 | ::= | 0000 0100 | 1000 0100 x00 |
| x05 | ::= | 0000 0101 | 1000 0101 x00 |
| x06 | ::= | 0000 0110 | 1000 0110 x00 |
| x07 | ::= | 0000 0111 | 1000 0111 x00 |
Each non-negative integer can be represented in more than one way. As an example, the syntax class x05 covers all bit-vectors that represent the number five.
Identifiers are cardinals used for identifying something. When parsing an identifier one may choose to parse it as a cardinal, convert it to a number, and then do further processing based on that number.
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