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diff --git a/1286/CH12/EX12.11/12_11.sce b/1286/CH12/EX12.11/12_11.sce
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+clc
+//initialisation
+t1=5.6//c
+t2=2.8//c
+t3=0.7//c
+d1=2//m
+d2=4//m
+d3=8//m
+w=(2*3.14)/365
+//CALCULATIONS
+d=(log(t1/t2))/(d2/d1)
+k=w*1000/(d*d)
+//results
+printf(' \n diffusity= % 1f m^2 per day',k)