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(100 0 ) 75% 10% 15%

Jones1986a
40 %
75% Grady 1987

Basili Perricone1984

Hewlett-Packard 25%

50%

1 2

25-2

15 20

1 10 10

1000 10 20

0 5 243

Harlan Mils ” ” 3
0.1
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