What is the reason for the warning message about the lack of a unit statement when using "2;3;;"?

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The warning message about the lack of a unit statement when using "2;3;;" is because the semicolon-delimited values are being interpreted as a list of numerical values without any unit or dimension specified. This can lead to ambiguity and error in calculations, as the meaning of the values may not be clear without a unit statement. Therefore, it is important to always include unit statements when working with numerical values.