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ACROSS
1)  tough protective covering of the woody stems and roots of trees and other woody plants
2)  a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
3)  the 6th letter of the greek alphabet
4)  domesticated bovine animals as a group regardless of sex or age; ; ; - bible


DOWN
1)  a man who is a stupid incompetent fool
2)  the highest point (of something)
3)  a magnitude or frequency relative to a time unit
4)  a secret society of white southerners in the united states; was formed in the 19th century to resist the emancipation of slaves; used terrorist tactics to suppress black people

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bark
opal
zeta
oxen