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The presence of a `@' anywhere on a line indicates the start of a comment that extends to the end of that line.
If a `#' appears as the first character of a line then the whole line is treated as a comment, but in this case the line could also be a logical line number directive (see Comments) or a preprocessor control command (see Preprocessing).
The `;' character can be used instead of a newline to separate statements.
Either `#' or `$' can be used to indicate immediate operands.