There are times when you should request copies of your records: 1  Permanent Change of Station. 2  Deploying. 3  Retiring.
0. EXPERT ANSWER. Double coincidence of wants refers to a situation in a barter system where the goods or services offered by a seller are exactly the same as that required by a buyer and vice versa.
Double first cousins arise when two siblings reproduce with another set of siblings and the resulting children are related to each other through both parents' families. Double â¦ first cousins share both sets of grandparents in common and have double the degree of consanguinity than ordinary first cousins.   Double second cousins would be the children of double first cousins.   Two cousins are removed when they are are a different number of generations from their shared ancestor. When that difference is one generation, they are once removed.