Flattening lists

Sometimes we need to group things based on context

Example:

my @a = 5,6;
my @b = 1, 2, (3, (4, @a)), 7;

mysub 1, 2, (3, (4, @a)), 7;

Q: How many arguments are passed to mysub()?

• a. 4
• b. 6
• c. 7
• d. other

Answer: 4