Source #96-1

test = [['a','b','c'],\
    ['d','e','f'],\
    ['g','h','i']]

def display(x):
  for current in x:
    print current
  print

def substitute(x):
  for row in range(0,len(x)):
    for col in range(0,len(x[row])):
      temp = x
      temp[row][col] = '*'
      display(temp)
  print 'x is equal to:'
  display(x)

substitute(test)