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Rev Author Line No. Line
2071 zjchen 1 
!! +exec+ +vardef+
11219 bpr 2 
tit:exchange
3 
type:$type_exec
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syntax:!exchange`var1' and `var2'!\
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exchange`var1', `var2'
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mean:交换变量 `var1' 与 `var2' 的值.