Write a class called "Mother" that tracks all inheritances that are done to her (and her kids)

It seems like your solution wont work for grandchildren:

class Foo < Mother; end
class Bar < Mother; end
class Baz < Bar; end
Mother.phone_kids # => calls only Foo, Bar.

I have a similar result except that I used map instead of each, because the value that will be returned after calling phone_kids is the array of results of each kid call and not an array of kids all the time

holy mother of all that is good and pure...

ahh! finally got it. Thank you!

In this case, the minor words are "an", "often" and "into". The only words you should consider minor are those passed as a parameter. So e.g. "of" is not a minor word by default.

I don't get it

Test Failed: Gave title="First a of in", minor_words="an often into". Expected "First A Of In" but got "First a of in".

What? 'an of in' are minor no?

any? is a better pattern than all?