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Of course, a more complex version of the sentence is "Clouds of condensation can sometimes be seen rising from manholes in Manhattan, although this is usually caused by external water being boiled by contact with the steam pipes, rather than leaks in the steam system itself".<unk> Of course, a more complex version of the sentence is "Clouds of condensation can sometimes be seen rising from manholes in Manhattan, although this is usually caused by external water being boiled by contact with the steam pipes, rather than leaks in the steam system itself".<unk>