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    my %x = (field => $F[$_ - 1], value => $F[$_]);
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    my %x = (field => $F[(--$_)++], value => $F[$_]);
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    my %x = (field => $F[--$_++], value => $F[$_]);
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    my %x = (field => $F[--$_], value => $F[++$_]);
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    my %x = (field => $F[~-$_], value => $F[$_]);