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...it's all about simple mathematics:
90% = 90% (one conversion)
81% = 90% of 90% (two conversions)
73% = 90% of 90% of 90% (three conversions)
66% = 90% of 90% of 90% of 90% (four conversion)
...the fewer times you convert energy, the "...more of it (energy) you have...", or stated conversely the "...less you've lost."
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