problem 23 in 0.188s
question 4 in 0.084s
question 5 in 1.449s
question 6 in 0.001s
question 7 in 1.868s
question 8 in 0.002s
question 9 in 0.002s
question 10 in 0.259s
question 11 in 0.002s
question 12 in 0.187s
question 13 in 0.002s
question 9 in 0.002s
question 21 in 0.014s
question 21 in 0.014s
question 23 in 0.188s