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user@linux-mint ~/perl_practice $ more greet_add_sub.pl 
use strict;
...
Hi 10, Please join (1 2 3 4 5 6 7 8 9). You 10 fine folks add up to: 5
+5
Total is: 55
user@linux-mint ~/perl_practice $

user@linux-mint ~/perl_practice $ more num_triple_by2.pl 
use strict;
...
@tripled = 3 6 9 12 15 18 21 24 27 30
@div_by_two = 6 12 18 24 30
user@linux-mint ~/perl_practice $