Ambiguities can often be resolved by the selective use of semicolons instead of commas. Colons and semicolons are available but are not common in ordinary text. Multiple statements can be placed on a single line, separated by colons or semicolons. Both systems have the same rules regarding question marks, exclamation points, colons, and semicolons. In this way any duration can be indicated using a series of semicolons and commas. Pico lacks return statements, and uses semicolons as statement separators instead of terminators. Also, semicolons and carets are commonly used in Korean emoticons; semicolons mean sweating (embarrassed). It uses braces to denote code blocks and semicolons to separate rules within a block. Multiple statements can be placed on a single line, separated by semicolons. Authorities in a signal are separated by semicolons. Semicolons still terminate statements, but are implicit when the end of a line occurs. As languages can be designed without them, semicolons are considered an unnecessary nuisance by some. Multiple commands can be written on a line by separating them with semicolons (";"). The file system of VAX/VMS, Files-11, uses semicolons to indicate a file's version number. Semicolons (codice 9) at the beginning of the line indicate a comment.