Expr.adoc: typo on $# var
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@@ -1888,7 +1888,7 @@ At each iteration, the following automatic variables are available for use in th
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* `$_`: the current element of the iterator.
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* `$_`: the current element of the iterator.
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* `$__`: the index of the current element in the iterator, starting from 0.
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* `$__`: the index of the current element in the iterator, starting from 0.
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* `$_#`: the number of elements already visited in the iterator, starting from 0.
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* `$#`: the number of elements already visited in the iterator, starting from 0.
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