A speleologist studies caves; a troglodyte lives in one.
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Those who were involved in the pioneer exploration of space, in the former Soviet Union, call their space travelers cosmonauts.
There is always a common factor. If there are no common prime factors, the GCF is 1.
It is possible that A has such properties.
That's the least common denominator or LCD.
it is not very common zirconium is found on excess gold so it is pretty common