What is the relationship between the following compounds? 
D-erythrose L-erythrose
Definitions:
Task Window
A pane or sidebar in software applications that provides options or tools relevant to the current task or activity.
Category List
An organized collection or grouping of items, subjects, or elements according to a set criteria or classification.
Quick Click
A user interface feature allowing the user to perform a function or command with a single click, increasing efficiency and speed.
Three Priority Levels
A system of classification that ranks items or tasks according to their urgency or importance into three categories.
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