number = 0. total= 10**5
for j in range(1,total+1): cell = [0,0,0,0] for i in range(12): cell[random.randint(0, 3)] += 1
if cell[0] > 0 and cell[1] > 0 and cell[2] > 0 and cell[3] > 0:
number += 1.
#print cell
print 'P: ', number/j
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