Parenthesis () creates LIST:
print 1, 'b', 3, 'd', 5, 'f', "\n";
I see a list there but I don't see any parentheses.
my @stuff = map $_ + 2, 6, 7, 8, 9, 10;
Parentheses are used for precedence.
my %h = ( 1 => 'j', 2 => 'b' );
There the assignment operator has higher precedence than the comma operator so the parentheses are required.
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