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R里面有几个内置常量，方便我们直接调用而非创建： 1、26个字母LETTERS, 小写字母怎么办？ 有letters > LETTERS [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q...
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