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Consider the following syntactic definition.
- EXAMple <string> { <example-statement> } END
-
- <example-statement>:==
-
- CHARge=<real>
-
- EXCLude=( { <atom> } )
-
- MASS=<real>
-
- TESTing=A1 | A2 | A3
-
- TYPE=<type>
-
- <string>:==
- any sequence of four characters.
The following input lines are possibilities for valid
constructs:
example A type=ABCD mass=30.0 end
example B type=BBBB charge=5.0 exclude=( A B C D ) end
example C charge=5. mass=40.0 type=XXX testing=A3 end
example D end
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