'''
Exercise 21 - Dictionary Filtering

Create a dictionary of keys a, b, c where key has a value a list from:
 - 1 to 10  (for a)
 - 11 to 20 (for b)
 - 21 to 30 (for c)
''' 
d = {'a':list(range(1,10)),'b':list(range(11,20)),'c':list(range(21,30))}
print(d)
