The sigil for hash is %hash. &hash is an error.

Since a hash value must be a scalar, you need to make them array references. 

while (<DATA>) {
    my ($key, $val) = split;
    push @{$hash{$key}}, $val;
}

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See tye's References quick reference.

After Compline,
Zaxo

In reply to Re: Unique keys for multiple values with a Hash by Zaxo
in thread Unique keys for multiple values with a Hash by Anonymous Monk

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