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Brainwork
"Brainwork" in a Sentence (3 examples)
I cannot live without brainwork. What else is there to live for?
http://www.gutenberg.net.au/ebooks01/0100011h.html But not more comfortable than we need, I can tell you, comrades, with all the brainwork we have to do nowadays.
Its rules are so simple they can be explained in two sentences, yet the brainwork needed to solve it is quite complex.
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Unscramble this word: brainwork