An S4 class to represent multiple sets.
This class is adopted from ‘RVenn'. Since 'RVenn' doesn’t export this class, I have to copy its codes hereafter to use it.
setsA list object containing vectors in the same type.
namesThe names of the sets if it has names. If the list
doesn't have names, the sets will be named as "Set_1", "Set_2", "Set_3" and
so on.
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