Cowsay #1681

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/ The primary purpose of the DATA statement is to give names to constants;   \
| instead of referring to pi as 3.141592653589793 at every appearance, the   |
| variable PI can be given that value with a DATA statement and used instead |
| of the longer form of the constant.  This also simplifies modifying the    |
| program, should the value of pi change.                                    |
\ -- FORTRAN manual for Xerox Computers                                      /
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