Suppose a "secret pair" number is a four-digit number in which two adjacent digits are equal and the other two digits are not equal to either one of that pair or each other. for example, 2209 and 1600 are "secret pair" numbers, but 1333 or 2552 are not. how many "secret pair" numbers are there?

In 1914, alabama produced 1.7 million bales of cotton, but three years later produced only 515,000, bales. meanwhile, in georgia, 5.2 million acres of land was dedicated for cotton production in 1914, but by 1923 there were just 2.6 million acres used for growing cotton. all of this was the result of the work of a tiny insect: the boll weevil. alabama and georgia first felt the effects of the boll weevil at different times. what would account for this difference in timing?