In a column of numbers, the first 3 numbers are 1, 9, 9, and each subsequent number is the remainder obtained by dividing the sum of the previous 3 adjacent numbers by 3. What is the 2005th number in this column of numbers?
一列数，前3个是1，9，9，以后的每个数都是它前面相邻3个数的和除以3所得的余数，这列数中的第2005个数是多少．
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