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for each rule. Thus, suitable rules might be `\fBs/^/0./\fR' to prepend
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`\fB0.\fR' to the version number and `\fBs/_/./g\fR' to change underscores into
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this should not be a problem.
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\fIrule\fR may only use the '\fBs\fR', '\fBtr\fR' and '\fBy\fR' operations. When the '\fBs\fR'