Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
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但實際上，張又俠和習近平在早年並無交集，兩人在北京所上的並不是同一所學校，之後，習近平到陝西下鄉，而張又俠到雲南服役。到1980年代初，習近平回到北京，在國防部任秘書；而張又俠開赴中越戰爭的前線並立下戰功。
It is "probably the most dangerous time for adult Emperor penguins because they haven't got their waterproof suits on," he says. If they go into water, they are likely to die.
"We would basically take a screenshot of that house or residence and shoot it over to John and say 'would this house have these bricks inside?'" says Squire.