Use the data given for problem $6\mathrm{.}20$ in the text but use the Spiral Technique and construct a layout for a facility that is $130$ feet by $100$ feet. Note that the from$-$to chart above problem $6\mathrm{.}20$ goes with problem $6\mathrm{.}20.$ Determine the efficiency rating of your final layout. Comment on the pros and cons of your layout. $6\mathrm{.}20$ The from$-$to material flow matrix for an eight$-$department facility is given in the table below. Construct a relationship diagram based on the material flow matrix, and construct a block layout using the graph$-$based method.