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Given that, external dimensions are 6cm, 5cm and 4cm.

∴External will be as follows, length = 6 - (0.5 × 2) = 6 - 1 = 5cm . Width = 5 - (0.5 × 2) = 5 - 1 = 4cm  And hight=4-(0.5 × 1)=4-0.5=3.5cm. ∴The required volume of wood = External capacity - Internal capacity =(6×5×4)-(5×4×3.5)=120-70=50cm3.

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