Though auctions are common for all sorts of products, including electricity that utilities sell one another, experts said that mortgage-backed securities would pose difficult headaches because they are extraordinarily complex, difficult to value and come in almost limitless varieties.
Admiral Mullen said that a no-flight zone was "an extraordinarily complex operation to set up," an assessment shared by Gen. James N. Mattis, who oversees American military operations in the Middle East as the head of United States Central Command.
"The current system is extraordinarily complex, leading to fraught experiences for deafblind and multi-sensory impaired children," he said.
The easiest way to get one's mind round this extraordinarily complex world is to divide it into two categories: tax havens for individuals; and tax havens for companies.
Despite these advances, the extraordinarily complex cellular responses to MYC expression has made it difficult to decipher the target genes that mediate these biological activities.
The transmitters will soon be placed at Times Square and Grand Central Terminal, where it is "extraordinarily complex and difficult to get radio reception in and out," Mr. O'Leary said.
