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for (map{{el1=>$list[2*$_], el2=>$list[2*$_+1]}} 0 .. $#list/2) {
    # do things with $_->{el1} and $_->{el2}
}

for (my $i=0 ; $i < @list ; $i+=2) {
    my ($el1, $el2) = @list[$i,$i+1];
    # do things with $el1 and $el2
}