Construct a systems dynamics model (stock and flow diagram) based on the following description. Be sure to clearly label each element in the diagram. Assume this is a portion of a stock and flow diagram that a company could use to analyze inventory levels based ob human resource policies.

XYZ produces widgets at the rate of 100 per worker per week. They sell widgets at the rate of 400 per week per sales person. Production workers leave XYZ at the rate of 0.5% per week and are hired at the same rate. However, workers are not ready to produce as soon as they are hired; they first must go through a 3-week training program. Sales people leave XYZ at the rate of .25% per week and there is a 4-week delay between leaving and hiring. Once hired, sales people are ready to begin selling.