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This template is not usually used on its own but rather by other associated templates such as Template:Issue.
e.g. The following will return a colour name (lightblue):
Effort colours include:
- none = lightgreen
- done = green
- trivial = silver
- easy = lightblue
- medium = yellow
- routine = yellow
- tricky = orange
- unknown = red - i.e. we have no idea how to do this.