# Exercise 2.15

# Initialization
q = [['a', 'b', 'c'], ['d','e','f'],['g','h']]

# a)

q[0][0]   # Extract the letter 'a'
q[1]      # Extract the list ['d','e','f']
q[2][1]   # Extract the letter 'h' (alternative: q[-1][-1])
q[1][0]   # Extract the letter 'd'

# q[-1] is last element of outer level list: ['g','h']
# q[-1][-2] is 2nd last element of q[-1]: 'g'

# b)

# for i in q ---> i is a list object 
# for j in range(len(i))  ---> j is an integer