Given the following Product Structure Record 
The number of E's required for each A is
Definitions:
Power Plants
Facilities that generate electricity by converting various forms of energy, such as fossil fuels, nuclear power, or renewable sources, into electrical power.
Geothermal Energy
A renewable energy source derived from the natural heat produced inside the earth, used for heating and electricity generation.
Hot Water
Water that has been heated, typically used for bathing, cleaning, and cooking.
Biofuels
Biofuels are fuels produced from biomass resources, including plant materials and animal waste, used as an alternative to fossil fuels in transportation and energy production.
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