We can visualize lists in environment diagrams using box-and-pointer
notation. A list is depicted as adjacent boxes that contain the elements of the
list. Primitive values such as numbers, strings, boolean values, and None appear within an element box. Composite values, such as function values and
other lists, are indicated by an arrow.
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|status||not read|| ||reprioritisations|
|last reprioritisation on|| ||suggested re-reading day|
|started reading on|| ||finished reading on|