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3.3.4. Quotes Within Strings
Strings are delimited using single quotes or double quotes (but not
mixed).  One may directly use quotes inside a string if they are not
of the same type as the delimiters.  To get quotes inside a string
which *are* of the same type as the delimiters, the quotes must be
doubled.

Example

'This string ''contains'' quotes of "various" styles.';  -- CoCoA Input
This string 'contains' quotes of "various" styles.
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"This string also 'contains' quotes of ""various"" styles."; -- CoCoA Input
This string also 'contains' quotes of "various" styles.
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Imagine the difficulties in writing this section of the online manual
within a CoCoA package. ;>