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it is worthy to spend it is worthwhile spending it is worthy of spending it is worthwhile to be spent
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exactly as usual in common common
a large amount a great many a great deal a lot of
worth worth being spent worthy of worthwhile
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in case as though as long as even though
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Even though As if Now that So far
though besides yet therefore
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Solving the mystery of sleeping and waking requires new insights. Most of the other things people do regularly are biologically straightforward. The problem sounds rather grand. We still lack for progress though we' ve spent much more time studying it.
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