1  2  3 

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2  _  _  _

3  _  _  _


ACROSS
1)  (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
2)  a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
3)  a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal


DOWN
1)  an enclosed space
2)  the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
3)  a period of time containing 365 (or 366) days

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