there is no 6 in the your_set here:
my_set = {1, 2, 3, 4, 5}
your_set = {2, 3, 4, 5}
and in the Difference operator and so on...
and then i see this:
"For example, **if you this** to import the math module, you'll be able to call any function defined in that module without specifying the name of the module as a prefix." - i think i have missed 'do' in this sentence...
