| This class expands a string into a list of numbers. The main use is to select a
range of pages.
The general systax is:
[!][o][odd][e][even]start-end
You can have multiple ranges separated by commas ','. The '!' modifier removes the
range from what is already selected. The range changes are incremental, that is,
numbers are added or deleted as the range appears. The start or the end, but not both, can be ommited.
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