Consider the following shortest-route problem involving seven cities. The distances between the cities are given below. Draw the network model for this problem and formulate the LP for finding the shortest route from City 1 to City 7. 
Definitions:
Materials Price Variance
The difference between the actual cost of materials purchased and the standard cost, multiplied by the quantity of materials acquired.
July
The seventh month of the year in the Gregorian calendar, known for marking the midpoint of the calendar year.
Materials Price Variance
The difference between the actual cost of direct materials and the standard cost, multiplied by the actual quantity of materials used.
April
The fourth month of the year in the Gregorian calendar.
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