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The following expression is a postfix string for an arithmetic expression. 16 | -2 | 4...

The following expression is a postfix string for an arithmetic expression.
16 | -2 | 4 | * | 21 \ 17 \ - | / | 9 | + | 7 | 5 | +
But it contains one or more errors. Identify the error(s) and provide your own correction, which should be as simple as possible. Then produce the equivalent expression in infix form base on your correction. (The vertical bars serve only to separate the items in the expression, and do not form parts of the expression.)

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