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ruler (straight edged measure) / regulus / rank (in a table)
The ruler is a useful tool for measuring distances.
kinglet (king ruling over a small or unimportant territory) / goldcrest (Regulus regulus)
The kinglet ruled over a small mountain territory.
first-person singular present indicative of regolare
I adjust my watch every day.
slide rule
The slide rule was an important tool for calculations before the advent of electronic calculators.
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