Associative array in perl

["Adityan Murthy" <ad_it@xxxxxxxxxxx>]

Hi all,

1. How do i create an associative array using two values: $key and $value?
2. How do i check for redundant key values while creating the array?
3. How do i sort the array?
4. How do i run a loop from the first value to the last using foreach and 
access the key and the value each time?

Thanks in advance,

Adityan
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