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註釋In System 6, small-diameter, low-grade hardwood timber is used to make blanks in standard sizes. Blanks are made in one thickness and one quality class but in all the standard lengths during each production run. The quantity of blanks per length can be varied, while keeping total yield high, by using proper production control techniques. However, when the percentage of long blanks is increased beyond 15 percent, yields of required blanks will drop-though total yields remain constant-and earnings will be lowered. We describe a procedure that can be used to keep constant or improve earnings when the demand for long blanks exceeds the 15-percent level. S3.