Polya is a polymorphic list package I developed. It has special input and output capabilities for lists of arbitrary levels of nesting, as in rex. These are called Polylist's.
Polylists may contain any type of object, in any mixture. When an element of a Polylist is another Polylist, this fact is noted on output.
The default mode of formatting is S expressions, which are like rex lists except that
( ) are used instead of [ ], is dropped
Link to further information on the Polya Package.
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