Write a Ladder logic program that starts an assembly process at the press of a push button. The PLC needs to count from a proximity sensor mounted on the end of the assembly line. When ten products have been assembled and placed in a container box, a high signal pulse of $5$ seconds is passed to an actuator to push the container box out of the conveyer belt assembly and place a new box. The process keeps repeating until the factory fills $100$ boxes and after that a red LED is turned on to show that it is time for factory maintenance:

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