s :=<,sep>)

Combine the list into a single string using the comma-separated-values convention.

Each entry of l will be converted to a string if it is not a string already. If the entry contains the separator or a quote character, it will be delimited by quotes.

Returns:s - a string containing the entries of l combined using the comma-separated-values convention
Arguments:l - the list of entries to combine sep - the string to use as a separator. A single comma character , will be used by default.