What are the requirements for naming variables in R?

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A variable name can be a combination of letters, digits, dots, and underscores. It can’t contain any other symbols, including white spaces.
A variable name must start with a letter or a dot.
If a variable name starts with a dot, this dot can’t be followed by a digit.
Reserved words in R (TRUE, for, NULL, etc.) can’t be used as variable names.
Variable names are case-sensitive.

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