I looked through the G+ but haven't found any answer to a question we debated with +Philip Espi  at our usual tuesday DW session:

Choose a spell. You prepare that spell as if it were one level lower.

Is a 7th lvl spell prepared as a 6th lvl or as a 5th lvl (the next available lower level) ?
In other words do we understand "lower level" mathematically or literally ?
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