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ACROSS
1)  a narrow ledge or shelf typically at the top or bottom of a slope
2)  the post or function properly or customarily occupied or served by another
3)  plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
4)  a serious (sometimes fatal) infection of rodents caused by yersinia ____is and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal


DOWN
1)  a sudden minor shock or meaningless interruption
2)  a republic consisting of 26 of 32 counties comprising the island of ireland; achieved independence from the united kingdom in 1921
3)  any rational or irrational number
4)  a necessary or essential thing

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