The trouble is that even some simple-sounding problems (such as working out whether it is possible to cover an infinite plane with a given set of patterned tiles) are mathematically proven to be inherently noncomputable.

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Like nail-biting and interrupting, this patterned, almost automatic behavior needs to be broken with a specific and proactive approach one that uses old-fashioned goals, motivating tactics, and rewards.

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Bob Graham, a Democrat, and former Environmental Protection Agency Administrator William Reilly, who served under a Republican, are the picks to lead the panel, which could be patterned after past commissions that have investigated incidents such as the 1986 explosion of the Space Shuttle Challenger, the people said.

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This system, which is still in its earliest stages, has several drawbacks: not least, that not all atoms can easily be patterned in this way, and that the whole process has to take place at very low temperatures.

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His clothes were as ugly and incongruous as his two-tone swimsuit a baggy shirt, which looked black from my balcony but was probably patterned, and a pair of light-colored slacks that appeared to be a very pale blue, though that was possibly a reflection from the nearly invisible water.

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