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+// Example 4.9, page no-212
+clear
+clc
+sg1=0.85
+sg2=0.8
+span=150
+H=span/(sg1-sg2)
+printf("(a)\nH=%d mm = %dm",H,H/1000)
+span_min=1500
+span2=span_min*(sg1-sg2)
+span2=ceil(span2)
+printf("\n(b)\nD/P span = %d mm",span2)