What is the shortest amount of code to modify a hash within a hash in the following instances:
%hash{'a'} = { 1 => one,
2 => two };
(1) Add a new key to the inner hash of 'a' (ex: c => 4 in the inner hash of 'a') (2) Changing a value in the inner hash (ex: change the value of 1 to 'ONE')