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ACROSS
1)  tough protective covering of the woody stems and roots of trees and other woody plants
2)  a sign of something about to happen
3)  an informal form of address for a man
4)  any of several related languages of the celts in ireland and scotland


DOWN
1)  indicate by signs
2)  an asian river between china and russia; flows into the sea of okhotsk
3)  red color or pigment; the chromatic color resembling the hue of blood
4)  hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella

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bark
omen
dude
erse