I have been working hard to find the solution on my own however I have not comprehended the iteration and concatenation. I would appreciate a hint or someone to point me in the right direction 
   my @numbers = (4,7,11,14);
   my @numbers2= @numbers;
   my @numbers3= map {"$numbers[$_]$numbers2[$_]"} 1..$#numbers ;
   # result 447711111414
   my $white ='w ';
   my $rye =' r ';
   my $italian = 'i ';
   my $french = ' f ';
 
WANT THIS
$final_string = 'w 4 r i 4 f i 7 r w 7 f w 11 r i 11 f i 14 r w 14 f';

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The @numbers array element count will vary.
There are four sandwich patterns repeated .
1st element is preceded with $white followed by $rye (5th,9th,etc)
2nd element is preceded with $italian followed by $french (6th,10th,etc)
3rd element is preceded with $italian followed by $rye (7th,11th,etc)
4th element is preceded with $white followed by $french (8th,12th,etc)
after iterating it would be $final_string

In reply to array and concatenate by redmustang

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