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the limits statement to see if the installed version supports them. If
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it does support the "old style" assignment operators, the statement
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"a =- 1" will decrement \fBa\fR by 1 instead of setting \fBa\fR to the
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Other implementations of \fBbc\fR allow spaces in numbers. For example,
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"x=1 3" would assign the value 13 to the variable x. The same statement