... a list is an UNordered sequence of values. ... Lists cannot be accessed using an index.

I disagree with both these assertions. To my way of thinking, lists are most certainly ordered. In what sense do you think of them otherwise? They can also be array indexed:

c:\@Work\Perl>perl -wMstrict -le
"my $s = ('foo', 'bar', 'baz')[1];
 print qq{'$s'};
 ;;
 $s = (qw(zip zap zop))[1];
 print qq{'$s'};
 ;;
 $s = qw(hic hac hoc)[1];
 print qq{'$s'};
"
'bar'
'zap'
'hac'
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Note: I think the  qw(hic hac hoc)[1] example relies on a syntactic feature that, if not deprecated, is at least disparaged and contumed, and may be slated to go away someday/someversion (I'm running this with 5.14). It is certainly deprecated (as of 5.14) in a for-loop:

c:\@Work\Perl>perl -wMstrict -le
"for my $s qw(hic hac hoc) {
   print qq{'$s'};
   }
"
Use of qw(...) as parentheses is deprecated at -e line 1.
'hic'
'hac'
'hoc'
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