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ACROSS
1)  the yield from plants in a single growing season
2)  scottish philosopher whose sceptical philosophy restricted human knowledge to that which can be perceived by the senses (1711-1776)
3)  the smallest whole number or a numeral representing this number
4)  produce a literary work


DOWN
1)  the irregular motion of waves (usually caused by wind blowing in a direction opposite to the tide)
2)  any character from an ancient germanic alphabet used in scandinavia from the 3rd century to the middle ages
3)  a sign of something about to happen
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

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