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12 [[image - large circle]] 3 m 12 [[image - small circle]] 3 m' [[end page]] [[start page]] 12 Trays [[image - drawing of rectangular tray that is labelled as 12"x24"] 2 Balsa, per tray (24") 2 " " "[[ditto for Balsa, per tray]] (12") Sack [[image - drawing of rectangle that is labelled 14"x26" and has a wavy line around it that appears to be anchored at each corner outside the rectangle]] cut- Roll on balsa sticks-tack firmly Leave a well in the center (some slack) Covers 30" x 18" - sew rocks in the corners - use screen, mosquito netting, curtain material.