The figure below shows the possible routes from city A to city M as well as the cost (in dollars) of a trip between each pair of cities (note that if no arc joins two cities it is not possible to travel non-stop between those two cities) . A traveler wishes to find the lowest cost option to travel from city A to city M. 
Note: This question requires Solver.
Formulate the problem in Solver and find the optimal solution. Which of the following nodes are not visited?
Definitions:
Fault
A defect in a system that can cause it to fail or perform suboptimally.
Sealed Beams Headlights
Headlight units with a sealed, all-in-one design that includes the filament, reflector, and lens, providing a specific beam pattern.
High-intensity Discharge (HID)
A type of lighting technology that produces light by passing an electrical charge through a gas, often used in automotive headlights.
Fluorescent
Relating to the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength.
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